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Safety first

eBike batteries store a lot of energy in a small case. Handled right, that's fine. Handled wrong — or when a damaged pack keeps being used — it's a fire risk. This page is the line we hold on every guide we publish.

Battery red flags — stop using immediately if any apply

Battery casing is swollen or deformed
Casing is noticeably hot or too hot to touch
Burning or chemical smell from the battery or charger
Battery got wet or was submerged
Problems started after a drop or crash
Smoking or strange noises while charging
Cracked or otherwise damaged casing

What to do when a red flag applies

  1. Stop charging and stop using the bike

    Right away. Don't "finish the charge" or take one last ride.

  2. Move the battery away from anything combustible

    Outdoors on bare ground or concrete is best — away from the house, garage, car, or anything that can burn.

  3. Don't disassemble it, and don't keep trying

    No opening the case, no more charge attempts, no "let me just check if it still turns on."

  4. Contact the manufacturer or a professional battery service

    They can assess and replace the pack. Keep your proof of purchase — many of these failures are warranty cases.

  5. Dispose of the pack locally

    Use a battery recycling drop-off (many bike shops and hardware stores take them). Never in household trash.

What we never publish

  • Pack disassembly or "re-cell" walkthroughs — opening a lithium pack is how fires start.
  • BMS bypasses or resets that defeat protection circuits.
  • Attempts to revive dead, swollen, or water-damaged cells.
  • Speed-limit modifications — illegal on US roads and a drive-system risk.
  • Live work on high-voltage components.

Lithium battery handling basics

  • Match the charger. Use the manufacturer's charger for that pack — voltage and charge profile must match, not just the plug.
  • Charge sensibly. Ventilated area, hard non-flammable surface, and never unattended overnight.
  • Store at partial charge. Around 50% for winter or long storage, in a dry place above freezing.
  • Keep connectors clean and dry. Corrosion and water ingress cause intermittent faults and heat.
  • Retire old packs properly. A pack that no longer holds charge should go to battery recycling, not a shelf in the garage.

Emergency

If a battery is smoking or has caught fire, get away and call emergency services. A lithium fire can re-ignite — do not try to move or extinguish a burning pack yourself.

Last updated: November 2026.