LiPo Battery Safety: Charge, Store, Survive
The one guide every RC driver has to read first. How to charge, store and dispose of LiPo packs without starting a fire.
Updated Jul 4, 2026 · RC Crash Crew
Lithium Polymer (LiPo) packs give our rigs their punch, but they are the single most dangerous thing in the hobby. A LiPo does not just die when abused — it can vent, swell, and burn hot enough to set a garage on fire. Treat every pack with respect and none of this ever becomes a problem.
Charge on a non-flammable surface. Charge on concrete, tile, or inside a metal ammo can or LiPo-safe bag — never on carpet, a wooden bench, or the seat of your car. If a pack is going to fail, it usually fails while charging.
Never leave a charging pack unattended. This is the rule people break right before their bad day. Stay in the room. If you cannot watch it, unplug it. A LiPo fire goes from a puff of smoke to open flame in seconds, and once it starts it cannot be put out with a normal extinguisher.
Always balance charge. Use the balance lead so every cell finishes at the same voltage. A charger that only sees the main leads can happily overcharge one cell while the pack "looks" full. Set the charger to the correct cell count (2S, 3S, 4S) every single time — telling a charger a 3S pack is 2S is a classic way to overcharge it.
Respect the C rating and never over-charge. A healthy LiPo cell tops out at 4.2V. Charging past that damages the pack and is how fires start. Most chargers default to a safe 1C charge rate; there is rarely a reason to push higher.
Storage voltage is roughly 3.8V per cell. A LiPo left sitting fully charged (or fully drained) degrades fast and is far more likely to swell. If a pack will sit for more than a day or two, put it on Storage mode so each cell rests near 3.8V — that is about 50% capacity. Store packs somewhere cool and dry, out of direct sun and away from anything flammable.
Stop running before the pack is empty. Do not run a LiPo below about 3.0V to 3.2V per cell under load. Over-discharging permanently damages cells and leaves them prone to swelling. If your ESC has a low-voltage cutoff, use it. When a pack feels puffy, gets hot, or the rig goes soft, land it and let it cool.
A puffed or damaged pack is done. Swelling means the cells are off-gassing internally — that pack is retired. Never charge, run, or puncture a swollen or physically damaged pack. If a pack is crushed in a crash and gets hot or hisses, get it outside onto concrete immediately.
Disposing of a dead pack: discharge it fully first (many people submerge it in a bucket of heavily salted water for a couple of weeks until it holds no charge), then tape over the leads and take it to a battery-recycling drop-off. Do not throw a live LiPo in the household trash.
If a pack catches fire: do not use water on the pack itself and do not breathe the smoke — it is toxic. Get people back, let it burn out on a non-flammable surface if you safely can, and use a bucket of sand or a Class D extinguisher to keep the fire from spreading. This is exactly why we charge on concrete and never walk away.
Follow these habits every session and LiPos are perfectly safe. Skip them once and they are not.