How to Identify if a LiPo Battery Pack is Unsafe to Use

Question: How do I tell if a LiPo pack is unsafe to use?

Answer: To check if a LiPo battery pack is unsafe, start by inspecting the outer casing. Look for any swelling, puffiness, or bulging—these are signs the battery is damaged and should not be used. Next, check for any visible damage like cracks, punctures, or corrosion on the terminals. When charging or discharging, monitor the battery temperature; if it becomes unusually hot (over 60°C), stop using it immediately. Measure the voltage of each cell with a LiPo checker or multimeter—cells should be balanced and within the safe voltage range (typically 3.0–4.2 V per cell). If any cell reads below 3.0 V or above 4.2 V, the pack is unsafe. Also, if the battery emits a strange smell or leaks fluid, dispose of it safely. Always store LiPo packs in a fireproof container and never use a damaged or questionable battery to avoid fire risks. When in doubt, replace the pack to keep your projects and yourself safe.