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 determine if a LiPo battery is unsafe, inspect it carefully before each use. First, check for any visible damage such as swelling, puffiness, punctures, or cracks in the casing. A swollen pack is a clear sign it’s no longer safe. Next, look for any leaking fluid or corrosion around the terminals. Then, gently press the pack—if it feels soft or squishy instead of firm, avoid using it. Also, check if the battery is excessively hot after a short charge or use; overheating can indicate internal damage. Use a LiPo voltage checker to ensure each cell is balanced and within the safe voltage range (typically 3.7–4.2V per cell). If any cell reads significantly lower or higher, or the pack won’t hold charge, it’s unsafe. Never charge a damaged or swollen LiPo, and always store them in a fireproof container away from flammable materials. When in doubt, dispose of the pack properly at a battery recycling centre.