In 2024, UK fire services attended a statistically significant number of callouts involving lithium polymer battery fires in residential properties — most traced back to incorrectly charged or improperly stored RC batteries. This is preventable. Here's how.
The rules that actually matter
- Never charge unattended. Not even "just for 20 minutes." LiPo thermal runaway progresses from puffing to fire in under 90 seconds.
- Use a LiPo-safe bag or metal tin. A £8 fireproof bag is worth infinitely more than the £200 pack inside it.
- Store at storage voltage (3.8V/cell). Fully charged packs left for weeks degrade fast and become unstable. Most quality chargers have a storage mode — use it.
- Never charge a puffed pack. Puffing means internal gas production — the cell is compromised. Discharge to zero and dispose of at a recycling centre.
- Check your charger's current setting. Charging a 1300mAh pack at 5A is asking for heat and damage. 1C charge rate (1300mA for a 1300mAh pack) is the safe default.
When to bin a pack
Visible puffing. Dented casing. Pack that won't hold voltage for more than 10 minutes at rest. Any cell that reads below 3.0V after normal use. Anything that's been in a significant crash — internal damage is invisible.
Disposal in the UK
Discharge fully using a battery discharger or resistive load, then take to your local Household Waste Recycling Centre — they're legally required to accept LiPo batteries. Putting them in general waste or recycling bins is illegal under the Waste Batteries and Accumulators Regulations 2009.