LiPo battery guide for UK hobbyists
Lithium polymer batteries power RC cars, drones, FPV quads and planes. They are light and powerful, and they need respect. This guide explains the numbers and the safe habits.
What a LiPo is
A LiPo (lithium polymer) battery is a rechargeable battery made of one or more cells joined together. It packs a lot of energy into a small, light pack and can deliver very high current, which is why hobby models use it. The trade-off is that it is far less forgiving than the AA cells in your remote control. Overcharge it, over-discharge it, crush it or let it get damaged and it can overheat or catch fire.
Most problems are avoidable. They come down to using the right charger on the right setting, not leaving a battery charging unattended, storing it properly and retiring a pack that is swollen or damaged.
Start with the basics
- LiPo ratings explained: what the S, mAh and C numbers on the label mean and how to match a battery to your model.
- Charging and balance charging: the settings that matter and the mistakes to avoid.
- Storage voltage: why you should not leave a pack full or flat.
Keeping safe
- Swelling, damage and fire safety: when to stop using a pack and what to do if it goes wrong.
- Disposal and recycling in the UK: why a LiPo must never go in the bin.
Using LiPos
- RC, drone and FPV use: cell counts, flying habits and field charging.
- Flying with lithium batteries: what the UK Civil Aviation Authority says about cabin, hold and size limits.
- LiPo vs Li-ion: how the two chemistries and packs differ.
The five rules that matter most
- Use a proper LiPo charger on the LiPo setting with the correct cell count, and use balance charging.
- Never charge unattended and never leave a battery on charge overnight or when you go out. West Yorkshire Fire and Rescue gives the same advice for lithium-ion batteries in the home.
- Do not use a swollen, punctured or damaged pack. Retire it and dispose of it safely.
- Store at a mid charge, about 3.8 to 3.85 V per cell for longer than three days, in a safe place away from anything flammable.
- Never put it in household waste. Take it to a battery collection point or recycling centre.
Fire: what to remember
West Yorkshire Fire and Rescue warns that battery fires spread quickly, are hard to put out and produce highly toxic smoke. Its advice if one starts is: get out, stay out, call 999. Charge away from escape routes and combustible materials, and fit working smoke alarms where you charge.
Who this guide is for
It is written for UK hobbyists: people who fly a first FPV quad, run an RC car at a local track, or inherited a box of packs from a friend. It is also useful if you simply want to understand what is inside your drone battery before you take it on holiday. You do not need any electronics background. Where a point is about law or official guidance, such as air travel or drone registration, we say which organisation published it so you can check the current version yourself.
A note on facts
Figures on this site come from the sources listed at the foot of each page. Cell voltages and charging rules vary between battery makers, so treat numbers like storage voltage as a typical guide and follow your own battery's label. Questions or corrections? Use the contact page.
This is general information, not a substitute for the instructions that came with your battery and charger. If your manufacturer's advice differs, follow the manufacturer.
Frequently asked questions
Are LiPo batteries dangerous?
They can be if misused. Overcharging, over-discharging, damage and leaving them charging unattended are the usual causes of fires. Used and stored correctly they are widely used in hobby models.
Can I charge a LiPo overnight?
No. Fire services advise against leaving lithium batteries charging unattended, including overnight or when you are out.
Can I put a dead LiPo in the bin?
No. Lithium batteries can start fires in bin lorries and recycling centres. Take them to a battery collection point.
What is a safe storage voltage?
One typical guide is 3.8 to 3.85 V per cell for storage longer than three days. Many chargers have a storage mode.