Welcome to the world of Lithium Polymer (LiPo) batteries! They are the power source behind high-performance RC models, but their amazing power demands respect and care.
⚠️ Your safety is paramount. Please read this guide in its entirety. Failure to follow these instructions can lead to severe damage, personal injury, or fire.
If you only remember three things, make them these:
NEVER Leave a Charging Battery Unattended. Stay present and aware during the entire charging process.
NEVER Use a Damaged or Puffed Battery. If a battery is swollen, punctured, or damaged in any way, safely dispose of it. Do not use, charge, or store it.
ALWAYS Use a Proper LiPo-Specific Charger. Never use a charger for a different battery chemistry (like NiMH/NiCd).
Charging is the most critical phase for LiPo safety.
Use the Right Gear: Only use a quality balance charger designed specifically for LiPo batteries. We recommend charging inside a LiPo-safe bag or fireproof container.
Set it Right: Always double-check that the charger's voltage and cell count settings match the battery's label (e.g., 3S for a 3S battery). Incorrect settings are a primary cause of fires.
The "1C" Rule: For most batteries, the charge current should not exceed "1C". This is a simple calculation: a 1500mAh battery should be charged at a maximum of 1.5A. A 2200mAh battery at 2.2A, and so on. Charging faster than this can damage the battery and is a fire risk.
Cool Down First: Always let a battery cool down to ambient temperature after use before charging it.
Safe Environment: Charge in an open, well-ventilated area away from flammable materials like wood, carpet, or paper. Never charge a battery while it's inside your drone or RC model.
One at a Time: Do not charge multiple batteries in series or parallel unless you have a specific, professionally designed parallel charging board and understand the process completely.
Avoid Over-Discharging: This is the #1 killer of LiPo batteries. Never run a battery completely flat. A safe rule of thumb is to never let a cell drop below 3.3V under load.
Set Your Low-Voltage Cutoff (LVC): Configure your drone's or vehicle's ESC to alert you or land automatically when the battery is low. A good starting point for your LVC is 3.4V-3.5V per cell.
Post-Crash Inspection: After any significant crash, immediately and safely disconnect the battery. Place it in a safe, open area (like on concrete) and observe it from a distance for at least 30 minutes. Check for punctures, swelling, or heat. If it shows any signs of damage, do not reuse it.
Don't Push a Weak Battery: If you notice a drop in performance or shorter flight times, the battery is nearing the end of its life. Pushing it harder can be dangerous.
Proper storage is key to a long and safe battery life.
Storage Voltage is Key: Never store LiPo batteries fully charged or fully discharged. For storage longer than a few days, they should be at their "storage voltage," which is 3.80V - 3.85V per cell. Most modern chargers have a dedicated "Storage" function that will do this for you automatically.
Cool & Dry: Store your batteries in a cool, dry place (ideally 4-25°C or 40-80°F) inside a fire-resistant container like a LiPo bag, metal ammo can, or terracotta pot.
Keep Them Separated: Never let a battery's positive and negative leads touch each other or any metal object. This will cause a short circuit and likely a fire. If you need to cut battery wires, cut each wire separately.
Transport Safely: When travelling, keep batteries in a LiPo bag and in your carry-on luggage (check with your airline for specific rules). Never leave them in a hot car.
Your batteries will tell you when they're unhealthy. You must listen.
Puffing or Swelling: This is the most obvious sign of a dangerous internal failure. If a battery is puffed—even slightly—it is no longer safe. Immediately remove it from service for disposal.
Physical Damage: Any punctures, deep dents, or tears in the outer foil covering mean the battery is compromised and unsafe.
Poor Performance: A battery that can no longer hold a charge, has very high internal resistance, or gives you significantly shorter run times is at the end of its life.
Never put a LiPo battery in household rubbish or household recycling. Do not try to make a damaged battery safe by charging it, discharging it, puncturing it, cutting its leads or placing it in salt water.
If the battery is hot, hissing, smoking or on fire:
Do not touch it.
Get out, stay out and call 999.
If the battery is swollen or damaged but is not showing signs of an active fire:
Stop using and charging it.
Keep people away from it and do not put it in a pocket, bag or bin.
Contact your local council's hazardous-waste service, tell them it is a damaged lithium battery, and follow their instructions before moving or transporting it. You can find the correct local service through GOV.UK's hazardous-waste disposal finder.
If the battery is undamaged and has simply reached the end of its useful life: follow your local council's battery-recycling guidance and use an approved battery collection or recycling service.