CHARGER DIAGNOSTIC

veh-ebike-generic-1Identify pack voltage class from frame badge or BMS sticker: 36V→42.0V max charge; 48V→54.6V; 52V→58.8V; 67.2V (16S). Confirm charger nameplate matches — voltage class mismatch is silent on dumb chargers but pack-damaging.

veh-ebike-generic-2Identify connector type. Bafang/Hailong = XLR-3pin (Pin 1 V+, Pin 2 V-, Pin 3 NTC most common — verify per pack). Giant = XLR-3pin with Pin 2 empty (deliberately deviated). Bosch System 2 = Rosenberger magnetic with 5V handshake on dedicated pin. Shimano STEPS = Higo 5-pin (verify pinout — no cross-brand standard).

veh-ebike-generic-3Bosch System 2 specific: clean ferrous dust off Rosenberger plug face and port with dry lint-free cloth. Bosch error 620 = 'Charger fault, replace the charger' per Bosch's own help center — but ALWAYS clean port first since dust-induced no-power is the dominant root cause.

veh-ebike-generic-4Shimano STEPS specific: chargers refuse to start (LED stays off) on ANY foreign material — water, oxidation, debris on the Higo connector. First diagnostic step is connector cleaning with ethanol on a cotton bud, NOT charger swap. EC-E6002 user manual is explicit on this.

veh-ebike-generic-5Bafang/Hailong third-party charger trap: pin 3 on XLR is often a temperature-sense / handshake line — third-party 2-pin chargers or wrongly-pinned 3-pin chargers may charge but bypass thermal protection. Confirm pinout against pack spec, not against connector shape.

veh-ebike-generic-6Higo connector replacement trap: visually-identical 5-pin Higo connectors from different brands have DIFFERENT internal wiring. Never swap aftermarket cables without verifying pinout against OEM service docs.

veh-emoto-generic-1Identify brand and voltage class. Talaria Sting = 60V (16S, full 67.2V). Talaria Sting R = 72V (20S, full 84V). Stark Varg = ships with purpose-built 3.3 kW charger that doubles as a stand; 220V socket full in <2h. Cake Kalk = removable battery + MEC NOVA-1000 external charger (58.1V/15A).

veh-emoto-generic-2If 'relay clicks but no current': measure pack voltage at charge port with multimeter. If below BMS wake-up threshold (Talaria Sting: <48V on 60V system; Sting R: <60V on 72V system), BMS is asleep — charger is healthy. Recovery is a low-current 'jump charge' from bench supply to bring pack above the threshold.

veh-emoto-generic-3Discharge plug seating: ensure pack discharge plugs are fully seated. Loose or disconnected discharge plugs make the bike not recognize the battery, and the charger may not start — this presents identically to a dead charger but is a connector reseat fix.

veh-emoto-generic-4Cake / Stark Varg: OEM-charger-only rule. Aftermarket chargers will brick the BMS — documented parallel to the Sur-Ron pattern. If a non-OEM charger is on the bench, STOP and source OEM.

veh-emoto-generic-5Talaria thermal-shutdown-at-80%-SoC: recurring community complaint, tracks to BMS-side over-temperature protection as cell-voltage spread widens near top-of-charge. Relief is to interrupt charge, allow pack cool-down (30-60 min), then resume. Not a hardware fault — practical fix is partial-charge habit (80% rather than 100%) to stay out of high-SoC heat zone.

veh-emoto-generic-6Talaria charger LED behavior: green at idle = healthy. Red while connected = charging. Alternating green/red after extended connection = top-balance soak in progress, NOT a fault. Stuck on green while pack is empty = BMS lockout (jump-charge needed) or discharge plug not seated.

veh-sur-ron-light-bee-x-1Confirm stock 67.2 V 10 A charger or known-CAN-aware aftermarket (Luna Cycle Sur-Ron-branded). Aftermarket 'dumb' chargers without CAN handshake are documented to brick the BMS — the BMS interprets the missing handshake as a tamper event. Log charger make/model/serial BEFORE connecting any non-OEM charger.

veh-sur-ron-light-bee-x-2Measure pack voltage at XLR pins 1 (+) and 2 (-) with no charger connected. A full Light Bee X pack reads 66-67.2 V. Locked-out pack typically reads 50-62 V. Below 50 V: do NOT bench-charge with dumb supply — request battery service or use Sur-Ron-aware charger.

veh-sur-ron-light-bee-x-3If pack is 50-65 V and BMS appears locked out: execute OEM forced-charging dance. Plug charger into pack via switched outlet. Toggle outlet ON. Observe 20-second fast-red blink, then 10-second solid red window. Toggle outlet OFF then ON ONCE during the solid-red window. Wait. Repeat up to 30 attempts with 10s pack disconnect between each. Switched outlet (not wall-switch flip) — the power interruption must be cleaner than ~100 ms.

veh-sur-ron-light-bee-x-4Pack thermal gate: BMS inhibits charging below 0 °C or above 60 °C. If pack is warm from a ride, wait 20-30 min before plugging in. If cold-soaked (<5 °C), warm indoors to ≥10 °C. Charger LED can appear 'on' with no current flowing while pack is out of thermal range.

veh-sur-ron-light-bee-x-5Inspect XLR pins for green oxide / water residue (Sur-Ron commute exposure). Clean with isopropyl, dry with compressed air, apply dielectric grease (sealant only — not conductor). Reconnect with audible click.

veh-sur-ron-light-bee-x-6BMS-bypass kit check (Motoclops, HighVoltagePEV, Lite Speed Bikes): aftermarket bypass kits remove both the precharge resistor and low-voltage cutoff. Bypassed packs silently over-discharge and overheat cell strings — documented to have short pack life. NEVER service a bypassed pack as if it were stock; brief customer on disposition.

veh-sur-ron-storm-bee-1Confirm OEM charger. NA Storm Bee: 119 V / 12 A. International: 96 V / 12 A. Cross-plugging an international (96 V) charger into an NA Storm Bee or vice-versa is documented to fault — both target the Storm Bee but list very different output voltages and the pack voltage classes differ.

veh-sur-ron-storm-bee-2Measure pack voltage at charge port. NA Storm Bee (119 V class) reads ~95-119 V depending on SoC. International (96 V class) reads ~75-96 V. Reading wildly out of range = wrong charger family or BMS lockout. Confirm against nameplate before any troubleshooting.

veh-sur-ron-storm-bee-3Storm Bee dual-pack behavior is not documented in OEM-quality sources accessible at authoring time. If customer reports dual-pack parallel-charging issues, escalate to Sur-Ron dealer or qualified service for OEM guidance. Do NOT assume Light Bee X procedures translate.

veh-sur-ron-storm-bee-4Aftermarket charger ban: Storm Bee is in the same OEM-charger-required category as Light Bee X 2024+. Non-OEM 'smart' chargers without verified CAN handshake are a documented BMS-brick risk. Refuse to service if non-OEM charger is in use; source OEM.

veh-sur-ron-storm-bee-5Connector inspection per Light Bee X protocol — XLR (or pack-specific connector) for oxide/water residue, dielectric grease application, audible reconnect.

veh-sur-ron-storm-bee-6Pack thermal gate: Storm Bee BMS shares the 0-60 °C charge window with Light Bee X. Higher pack thermal mass (1.4 kW charger, 48 Ah pack) means longer cool-down after a hard ride — wait 30-45 min before plugging in.

veh-escooter-generic-1Identify pack voltage class from deck badge or BMS sticker. 36V (Xiaomi/Ninebot M365 family), 48V (Niu, older Apollo), 60V (Apollo Pro), 72V (Dualtron Eagle), 84V (Dualtron X, Wolf Warrior).

veh-escooter-generic-2If charger is non-OEM / unbranded / online-marketplace replacement: voltage-test no-load BEFORE plugging into pack. Xiaomi M365 counterfeit chargers commonly overshoot rated voltage by 1-2V under load and blow BMS Z-fuses. Reading >42.5V on a 42V spec = return it, do not use.

veh-escooter-generic-3Identify connector. GX16-3 dominant on Apollo and Dualtron mid-range. GX20-4P appears on 84V Dualtron fast chargers. LP16 (insulated variant) on safer high-amp SKUs. Cross-check voltage class — same shell across 36V to 95V chargers is common, and mating geometry alone does NOT confirm compatibility.

veh-escooter-generic-4Kick-scooter mechanical strain check: bent GX16 center pin is the #1 connector failure on escooters (rare on ebikes). Visible bend or wiggle-test-shows-flicker confirms. Replace connector if bent — straightening rarely holds.

veh-escooter-generic-5Dual-port escooter (Dualtron X, Wolf Warrior, some Apollo Pro): verify BOTH chargers connected and both LEDs lit before diagnosing 'slow charge'. Single-port charging is half-rate — NORMAL behavior, not a fault.

veh-escooter-generic-6BMS deep-sleep check on long-stored escooters: pack reads 0V at output but cells inside may be healthy. Some Xiaomi/Apollo BMS require a momentary pulse on the discharge pin or a brief connection to a charger of correct spec before output activates. Consult OEM-specific wake procedure.

veh-segway-gt3-1Identify exact model: GT3 (46.8 V) or GT3 Pro (72 V). Read frame badge or app. The two are not interchangeable in any respect — voltage, charger, charge time, dual-port (Pro has none either, contrary to common assumption).

veh-segway-gt3-2Confirm charger SKU matches the scooter. GT3 Pro charger = 'Charger-83V4A-GT3 Pro' (~83 V / 4 A, 332 W). GT3 base charger = stock unit OR 'Charger-54.6V/1.3A-AMR-GT3' (slow travel accessory). Cross-plugging: GT3 Pro charger into GT3 base will overvoltage the pack; GT3 base charger into GT3 Pro will simply refuse to charge.

veh-segway-gt3-3Measure pack voltage at charge port. GT3 Pro should read 72-84 V depending on SoC. GT3 base should read 46.8-54.6 V. Reading outside range = wrong charger or BMS lockout.

veh-segway-gt3-4Cold-cell charge lockout (winter): Segway BMS refuses charge below 0 °C and above ~40-45 °C ambient. Charger LED can appear 'on' while no current flows. Warm pack to room temperature indoors for 30+ min before retry. Most common winter 'my charger broke' service ticket in cold markets.

veh-segway-gt3-52024+ Segway authenticated-charger handshake: third-party chargers with correct voltage and connector may show 'no valid source detected' or persistent flashing-red LED — this is firmware rejection, NOT hardware. Confirm OEM SKU. Replace any third-party unit before further triage. (Low-confidence community source — verify with Segway service if pattern is in dispute.)

veh-segway-gt3-6Segway Mobility app charge-limit check: a user-set limit (e.g. 80%) will surface to the tech as 'won't charge to 100%'. ALWAYS check the app's charge-limit setting before tearing into the pack.

veh-segway-gt3-72015/2017 Segway off-board charger recall historical context: Segway PT chargers from Nov 2012-2014 and Jan 2015-Oct 2016 had a documented short-circuit + overheating pattern (positive terminal contacting nearby conductive components). This is NOT the modern GT3 generation, but the inspection mindset applies — any older Segway charger arriving at the bench warrants inspection for terminal-cover damage before service.

veh-segway-xyber-1Confirm OEM Xyber charger: '48V 10A-ion battery charger-Xyber'. Heavy brick-like unit with specialized directional plugs (proprietary Segway form factor, exact pinout undocumented publicly). Connector geometry confirmation should be done against the charger nameplate, not by attempting to mate.

veh-segway-xyber-2Single vs dual pack? If dual, Y-splitter cable is required to charge both simultaneously. Inspect Y-splitter for melted plastic, bent pins, oxidation. Replace if any visible damage. Verify both legs deliver voltage at the pack connector with multimeter.

veh-segway-xyber-3Dual-pack asymmetric-charge fault: if Xyber display shows one pack at 100% and the other stuck below after full charge cycle, fault is in the trailing pack OR in the Y-splitter contact for that leg. Disconnect Y-splitter and charge each pack individually for one full cycle. If divergence persists on a single pack alone, that pack is the fault.

veh-segway-xyber-4Cold-cell charge lockout (shared with GT3 line): Segway BMS refuses below 0 °C and above ~40-45 °C ambient. Charger LED can appear 'on' with no current flow. Warm to room temp 30+ min before retry.

veh-segway-xyber-52024+ authenticated-charger handshake: same firmware-level handshake risk as GT3 Pro. Third-party chargers may show 'no valid source detected' despite correct voltage and connector. Use OEM only.

veh-segway-xyber-6Y-splitter does NOT double charge rate (common owner misconception). Dual-pack charge time scales to ~6.5-7 h because the 480 W source splits across both packs — not a defect, just physics. Brief customer if they're expecting faster charging with two packs.

veh-segway-xyber-7BMS soft-lockout recovery via Segway Mobility app or Ninebot Flasher: after deep discharge or comm-error event, soft lockout can be cleared without disassembly via the app's BMS reset function.

veh-eskate-generic-1Identify pack voltage class. Meepo 10S = 42V, Boosted V2/V3 10S = 42V, Evolve 12S = 50.4V, Backfire 10S/12S, Lacroix 20S = 84V (high-perf), DIY VESC builds 12S/20S+.

veh-eskate-generic-2Identify connector. Boosted V2/V3 = proprietary magnetic (pogo). Meepo/Backfire/Evolve = XLR-3. DIY VESC = XT60/XT90/XT90S loop-key. Confirm charger geometry matches port.

veh-eskate-generic-3Boosted specific: remove battery, inspect O-ring seat for debris. Remove or clean O-ring. Retighten threaded battery connectors using the OEM Boosted plastic connector tool ONLY — pliers strip the soft threaded metal rings and damage is irreversible.

veh-eskate-generic-4DIY / Trampa / VESC specific: 'charger fault' is more often water ingress in the ESC enclosure than a real charger failure. Uncoated VESC PCBs corrode in damp environments — BMS misreads cascade into charger-side symptoms. Open ESC enclosure, dry 24-48h with desiccant before re-attempt.

veh-eskate-generic-5DIY pre-charge resistor check: builds ≥72V require a pre-charge resistor (~100Ω, higher for higher voltages) before bulk-contact closure. Without it, plugging in produces visible arc that pits the connector and stresses ESC capacitors. Verify pre-charge is functional on the loop key or anti-spark switch.

veh-eskate-generic-6XT90S anti-spark insertion rule: must be inserted slowly enough for pre-charge phase to complete (~50ms). Slamming connector home defeats the pre-charge resistor and causes the same inrush arcing the design exists to prevent. Train customer on slow-insertion technique.

veh-euc-generic-1Identify brand and voltage class. Kingsong 67.2V (16S), 84V (20S), 100.8V (24S), 126V Inmotion V13 (30S). Begode RS/EX.N/Sherman commonly 100.8V (24S). Veteran Sherman 100V. Confirm against the wheel's manufacturer documentation.

veh-euc-generic-2Identify connector. Kingsong (historic) = GX16-3. Current high-voltage Kingsong = GX20-4P (pins 1/2 V+, pins 3/4 V-). Begode/Sherman = GX16-5. Inmotion V11/V13 = model-specific magnetic. Inmotion chargers look identical across V8/V10/V11/V13 but pin layouts DIFFER — using a V11 charger on a V13 can damage the BMS even though the connector mates.

veh-euc-generic-3Begode/Gotway brand-+-voltage gate: any thermal or swelling complaint on a Begode 100V Nikola, 100V Master, Sherman, EX.N, or RS has elevated fire-risk priors. Default response for swelling/odor symptoms on these models is 'evacuate and dispose' before further test.

veh-euc-generic-4Parallel-charging behavior: most EUCs accept TWO chargers in parallel via Y-splitter or dual-port mod. Asymmetric current draw between the two chargers during BULK phase is NORMAL (not a fault). Asymmetric current near full charge indicates pack divergence — see won't-balance symptom path.

veh-euc-generic-5Decode Kingsong charger fault codes if displayed. 5002 = charge current >7A (stop charge immediately). 5004 = single cell >4.25V (stop). 5008 = pack temp >45°C charging (stop). 5024 = total voltage >126.5V charging (stop). 5028 = pack temp <-5°C charging (stop). All five = interrupt charge before BMS hits a hard fault.

veh-euc-generic-6EUC current-derating below room temp: LG M50T cells (common in Begode/Veteran) cap charging at 3.4A. eWheels-style GX16-5 chargers ship with 6A/8A current selectors — the higher setting may exceed cell spec at cold ambient. Always reduce to lower current setting when ambient <15°C.

veh-onewheel-generic-1Identify model line: Pint, Pint X, XR, GT, GTS, or Original/+. Pint family = GX12-2 connector, 63 V (Pin 1 V+, Pin 2 ground), stock 1.3 A charger. XR = 3-pin XLR, 63 V (Pin 1 ground, Pins 2/3 V+), 3 A stock. GT = 3-pin proprietary, 75.6 V, 5.2 A Hypercharger. GTS = separate voltage family from GT (NOT interchangeable).

veh-onewheel-generic-2Verify charger model number matches the board family. Pint = FY630130 (1.3 A) or FY630300 Ultracharger (~3.5 A). XR = stock 3 A or aftermarket Hypercharger (~6 A, e.g. ChiBatterySystems XRFC). GT Home = FY7562500. GT Car = FY7561600D. GT Hypercharger = FY7565200. Wrong model = NOT a slow-charge fault, that's expected behavior.

veh-onewheel-generic-3Charger LED interpretation: solid red = delivering current, solid green = full (output ≤0.3 A in CV saturation). ANY blinking pattern = fault. Apply Future Motion isolation: unplug from board, observe LED at wall only — if it blinks with no board attached, charger is the failure (do not retry on board, risk of BMS damage). If LED behaves normally at wall but blinks only with board attached, the board is rejecting charge.

veh-onewheel-generic-4Alternating red/green during charge cycle interpretation: NOT normal balance behavior. Indicates thermal cycling at charger's internal regulator. Brick is near end-of-life — replace before failure causes a slow-charge or no-power complaint.

veh-onewheel-generic-5CPSC 2023 recall firmware check (REQUIRED on every Onewheel service touch): confirm Haptic Buzz firmware is current. The recall covers Original, +, XR, Pint, Pint X, GT (~300,000 boards). Remedy is firmware update — un-updated boards have an active safety advisory regardless of charger condition.

veh-onewheel-generic-6Decode Onewheel error codes (lightbar blinks on Pint/GT; blue LED on XR). Error 3 = overcharged (regen with full battery, common on long descents). Error 16 = invalid hardware (battery connection / pinched wires / water damage). Error 17 = battery temp out of safe range. Error 21 = charger connected (informational). Error 23 = incompatible hardware (XR 4210+ BMS-controller pairing mismatch — temporary fix is power cycle; permanent is RMA).

veh-onewheel-pint-1Confirm pack voltage on GX12-2 plug at the board with multimeter. Pin 1 should read +63 V (range 60-67 V depending on SoC) with charger unplugged. Pin 2 is ground. Reverse-polarity probe = pinout mismatch, STOP.

veh-onewheel-pint-2Identify charger SKU: stock home FY630130 (1.3 A) or Ultracharger FY630300 (~3.5 A). Customer 'slow charge' complaint with FY630130 on a Pint X is expected behavior (~280 min), not a fault.

veh-onewheel-pint-3Inspect GX12-2 pins for corrosion (green/white oxide from rain exposure on commute boards), bent pins from cable yank, pitted contact face. Clean with isopropyl + cotton swab. Replace OEM Pint Charger Plug if pins are pitted or spread.

veh-onewheel-xr-1Confirm XR XLR pinout at the board with multimeter. Pin 1 = ground. Pins 2 and 3 = both +63 V (paralleled for current sharing). Probe each pin pair. If readings don't match (e.g. Pin 1 reads positive), STOP — pinout mismatch or rewired non-OEM cable.

veh-onewheel-xr-2Inspect for Error 23 (Incompatible Hardware): XR 4210+ pairs BMS to controller. Power cycle clears temporarily; permanent fix is RMA or community Owie firmware (warranty-voiding and disables Haptic Buzz safety telemetry).

veh-onewheel-xr-3If aftermarket Hypercharger (ChiBatterySystems XRFC, Luna, Craft & Ride) in use: confirm 6 A delivery within ±5% of nameplate via clamp meter. Warn customer that fast chargers degrade battery life and operate without OEM CAN handshake.

veh-onewheel-gt-1Confirm GT pack voltage with multimeter at the GT proprietary 3-pin connector. Full-charge no-load: 75.6 V ±2% (74.1-77.1 V). Reading >77.1 V → OVER-VOLTAGE suspect, escalate and inspect pack. Reading 60-72 V → SoC-dependent low (discharged pack); not a fault, recharge before further diagnostic. Reading 63 V or close to it on a SoC-unknown pack: confirm against another full-charge reference — could be wrong charger family (Pint/XR class) plugged in by mistake.

veh-onewheel-gt-2Identify charger SKU. Stock: FY7562500 (home), FY7561600D (car), FY7565200 (Hypercharger). Aftermarket Hyperchargers (Luna, JW Batteries, ChiBatterySystems, Craft & Ride) void warranty and operate without OEM handshake — entire safety burden falls on the BMS. Warn customer.

veh-onewheel-gt-3If 'Corrupted memory' error appears after recent battery or BMS work: requires Factory Mode calibration via BLE. Calibration is BLOCKED on firmware Cassiopeia 6132+. Check firmware version before attempting — if 6132+, the calibration path is closed and Future Motion RMA is the only resolution.

veh-onewheel-gt-4GT Hypercharger Bluetooth pairing check: Hypercharger is board-paired (locked to controller via Bluetooth). A replacement Hypercharger appears 'dead' until re-paired through the Onewheel app. Out-of-box behavior is a charger waiting for pairing, NOT a hardware failure.

veh-onewheel-gts-1Confirm charger nameplate matches GTS S-Series spec. Cross-plugging a GT charger (75.6 V) into a GTS pack (different voltage family) will damage the pack. Always read the charger label before connection — never assume cross-compatibility based on plug shape.

veh-onewheel-gts-2Pack voltage measurement: read at the GTS connector with multimeter (no load). Confirm against the OEM-specified GTS S-Series nominal voltage (consult Future Motion product page or the matching home charger nameplate). DO NOT assume 75.6 V (that's GT, not GTS).

veh-onewheel-gts-3'Corrupted memory' check: same pairing constraints as GT. Battery or BMS replacement triggers the error and requires Factory Mode calibration to clear. Blocked on firmware Cassiopeia 6132+. Check firmware before attempting — if newer, RMA is required.

veh-onewheel-gts-4GTS Hypercharger Bluetooth pairing check: like GT, the GTS Hypercharger is board-paired. Replacement Hypercharger appears 'dead' until re-paired via the Onewheel app.

veh-onewheel-gts-5Identify charger SKU. GTS uses a GTS-specific charger family (NOT the GT 75.6 V units). Aftermarket Hyperchargers (Luna, JW Batteries, ChiBatterySystems, Craft & Ride) void the Future Motion warranty and operate without OEM handshake — the entire safety burden falls on the pack BMS. Warn customer.

sym-swelling-or-odor-3sEVACUATE the area immediately. CALL 911. DO NOT RE-ENTER. Notify any other personnel in the building. If AVD or copious water suppression is to be deployed, fire services or a certified Li-ion-suppression-trained employee does it — NOT the diagnostic tech. The off-gas-to-flash window is 2-30 minutes per Honeywell.

sym-swelling-or-odor-3hTreat as active thermal event. EVACUATE area immediately. CALL 911. DO NOT RE-ENTER. The off-gas window (Honeywell: 2-30 minutes) is exactly when flash events occur. Move other personnel to safe distance. Notify supervisor.

sym-swelling-or-odor-3vDon nitrile gloves and safety glasses. Move pack to non-combustible containment vessel (metal pail, sand bucket, or commercial battery-fire bin) OUTDOORS or in designated battery isolation room. Keep ≥3m from combustibles and ≥1m from other batteries.

sym-swelling-or-odor-4vPhotograph pack from multiple angles for incident record. Note serial number, vehicle, customer, last-known charging event, any recent impacts.

sym-swelling-or-odor-5vMonitor isolated pack for minimum 24h. Check surface temp with IR thermometer every 30 minutes for first 4h, hourly after. ANY temperature rise, new odor, smoke, or sound → escalate (re-confirm containment, EVACUATE + 911 if escalating to active thermal event).

sym-swelling-or-odor-3oTreat same as visible swelling. Don PPE. Move to non-combustible containment with clearances (≥3m from combustibles, ≥1m from other batteries). Monitor 24h+ on the same schedule. Off-gas precedes thermal runaway by 2-30 minutes per Honeywell — odor alone is sufficient retirement signal.

sym-thermal-shutdown-5aRelocate to ambient <30°C (chargers rated 0-40°C operating). Retest with IR thermometer monitoring surface temp during charge. Healthy: <50°C. Marginal: 50-60°C. Fault: >60°C.

sym-thermal-shutdown-5bMove charger to hard, non-flammable surface with vents unobstructed. Never charge on carpet, fabric, inside a closet. Re-test.

sym-thermal-shutdown-5fPower off charger. Confirm fan spins freely by hand. Listen for bearing noise on retest. Replace fan or retire charger if fan is seized.

sym-thermal-shutdown-5cFailed capacitor, shorted winding, or overcurrent without limiting → replace charger with OEM or UL 2849 unit. Do NOT field-repair sealed switching-mode supplies — high-voltage capacitors retain charge.

sym-thermal-shutdown-5pPull BMS log if accessible. Quarantine pack on non-combustible surface for 24h with monitoring (IR thermometer every 30 min for first 4h, hourly after). Repeated thermal events without explanation = pack requires cell-level inspection at qualified service center, do not return to service. Tech_signature + supervisor sign-off (safety_critical) required.

sym-thermal-shutdown-5tRetire charger immediately to safe disposal. Document make/model/serial in incident log. Replace with OEM or UL 2849 unit.

sym-no-power-7bMeasure pack voltage at main discharge terminals. If <2.4V/cell × series count, BMS is in deep sleep. For 60V/16S (Sur-Ron Light Bee X, Talaria Sting): <38V means sleep. For 48V/13S: <31V. For 36V/10S: <24V. For 72V/20S (Talaria Sting R, Segway GT3 Pro): <48V. For higher-V emoto packs: consult the vehicle branch — bench-supply wake is forbidden on Sur-Ron 2024+, Onewheel GT/GTS, and 2024+ Segway.

sym-no-power-8bWake attempt — ROUTE BY VEHICLE: Sur-Ron Light Bee X / Storm Bee — execute the OEM forced-charging dance from veh-sur-ron-light-bee-x-3. Onewheel GT/GTS — bench wake is forbidden; escalate to qualified battery service. Talaria Sting — gentle jump-charge from bench supply to ~48-52V on 60V system (per Talaria community guidance, with caveats; if charger doesn't engage after wake, escalate). All others — connect a smart charger (Cycle Satiator profile set to current-limit ~C/20) and monitor. NEVER shotgun-charge a deep-sleep pack with a dumb high-amp supply.

sym-no-power-7cSwap with known-good OEM charger of matching V/A spec. If vehicle now accepts charge → original charger is the failure, replace. If vehicle still does not accept → fault is downstream.

sym-no-power-7nReplace connector (charger-side OR vehicle-side). Solder per OEM pinout. Verify polarity with multimeter before reinstating.

sym-no-power-7vEscalate to BMS replacement or send pack to qualified battery service center. Do not field-repair internal BMS faults.

sym-no-power-7wReset GFCI / replace wall fuse / try alternate breaker. Verify wall-side restoration with three-light outlet tester.

sym-slow-charge-6aIf pack is >2 years old and all upstream checks pass: log cycle count and capacity reading. Aged-pack slow charging is normal capacity-fade behavior, not a fault. Counsel customer on expected end-of-life timeline.

sym-slow-charge-6bCool pack to ambient (or warm cold-soaked pack). Re-attempt charge with IR thermometer monitoring. Healthy charge proceeds at full rate when pack is in 10-25°C window.

sym-slow-charge-6cCharger output stuck at fractional amperage = failing primary stage or aging caps. Replace with OEM-spec unit.

sym-slow-charge-6vStop using mismatched charger immediately. Source correct nameplate-voltage unit. Inspect pack for over-voltage damage (cell vent, swelling, BMS Z-fuse blow).

sym-slow-charge-6pPort cleaned in sym-slow-charge-4 — if voltage drop still >0.3V under load, replace connector. Apply dielectric grease on reinstall (sealant, not conductor).

sym-slow-charge-6dBMS-side smart override is limiting current. Source OEM smart charger that handshakes with the BMS. Aftermarket dumb chargers will continue to under-deliver.

sym-wont-balance-5rSpread now <50mV after soak — normal pack behavior recovered. Counsel customer on periodic balance-soak schedule (every 30-50 cycles for aging packs).

sym-wont-balance-5oPack must be removed from service. Schedule cell-level service at qualified battery rebuilder OR replace pack. Brief customer that continued use will drive the weak cell into overcharge — fire risk.

sym-wont-balance-5bVerify BMS balance wires intact and balance resistors not burned (smell of burned components, discoloration on BMS PCB). Replace BMS if balancer is confirmed dead. Pack itself may be salvageable post-BMS replacement.

sym-wont-balance-5wCharger profile target voltage is off (e.g. Satiator profile says 58.0V for a 52V/14s pack instead of 58.8V). Correct the profile to OEM spec. Re-soak. Wrong target = systematic under-balance.

sym-wont-balance-5eAged ebike packs commonly require 6-8h of plateau time for the BMS balance resistors to close the gap. Schedule overnight balance-soak (in fire-resistant cabinet, NEVER unattended outside the cabinet). Re-measure spread next day.

sym-charger-led-fault-6cCharger fault confirmed at wall test → replace with OEM or UL 2849 unit. Do not attempt field repair on sealed switching-mode supplies.

sym-charger-led-fault-6bPull error code from vehicle. Resolve per vehicle branch. If BMS lockout / cell-imbalance / thermal gate → may need balance soak, warm-up, OEM forced-charging procedure, or BMS reset per vehicle.

sym-charger-led-fault-6nClean and inspect; replace if pins are deformed or housing cracked. See charger-connector-* atoms for variant-specific failure modes.

sym-charger-led-fault-6vStop. Source correct-spec charger. Inspect pack for over-voltage damage if mismatched charger had been delivering current.

sym-charger-led-fault-6hFor Sur-Ron CAN, Onewheel GT/GTS board-pair, Segway 2024+ authenticated, Bosch System 2: confirm OEM charger. Aftermarket / non-OEM chargers without correct handshake are documented BMS-brick risks. Re-pair if needed (Onewheel GT/GTS via app). If handshake still fails with OEM charger, escalate to OEM service.

sym-intermittent-3aReplace the AC cable (IEC C7/C8 or C13/C14). Commodity part.

sym-intermittent-3dPop the connector, inspect pins under bright light. Bent pins → straighten with needle-nose if cosmetic (EXCEPTION: XT60/XT90 family — replace, do not straighten; pin material won't hold). Melted/carbonized → replace. Severe damage = full replacement, not repair. Clean with isopropyl + non-abrasive pick. Apply dielectric grease (sealant only — not conductor). Re-mate and retest.

sym-intermittent-3iFlex-test cable along full length, especially at strain reliefs (boot near plug, boot near brick). If cable is stiff/discolored at strain relief, internal copper is fractured. Replace cable or charger.

sym-intermittent-3tMonitor surface temp with IR thermometer during failing-charge attempt. Cutting out at ~60°C while warm → switch to thermal-shutdown protocol. Cutting out cool → internal capacitor or solder-joint fault, replace charger.

sym-intermittent-3lCycle Satiator 'Pwr Fault Error, Restart' or similar — per Grin doc, this is typically AC supply hiccup OR BMS repeatedly tripping protection mid-charge. Test on a different breaker. If error persists across multiple outlets, suspect BMS-side micro-tripping — branch to bms-micro-tripping.

sym-intermittent-3bBMS protection triggering on transient overcurrent or cell-voltage outlier, then auto-resetting. Pull BMS log if model supports (Onewheel app, Segway Mobility, Sur-Ron diagnostic port). Or escalate to qualified service center.

sym-intermittent-3wWiggle test passes and no thermal correlation → try a known-good substitute charger of matching spec. If issue persists, fault is in the vehicle/pack/BMS side. Branch back to no-power or charger-led-fault for further isolation.