Do not connect a removed laptop battery directly to a generic DC power supply. Laptop packs contain cells and protection electronics designed for a specific charging system; applying the wrong voltage or connections can cause overheating, fire, or battery damage.
How should you charge a laptop battery?
Use the laptop’s manufacturer-approved AC adapter or a charger explicitly listed for the exact removable battery model. Check the laptop or battery manual for supported USB-C charging, if applicable. If the computer does not charge, inspect the approved adapter and charging port, then use the maker’s troubleshooting or service process rather than opening the pack or bypassing its protection circuit.
What if the laptop battery is swollen or damaged?
Stop using and charging a swollen, leaking, unusually hot, or visibly damaged battery. Do not puncture, compress, disassemble, or try to revive it. The CPSC warns against separating lithium-ion cells from their packs. For a swollen Dell battery, follow Dell’s specific safety guidance; use the maker’s instructions for other brands. Follow the laptop maker’s service and disposal instructions. Dell’s safety guidance applies specifically to its lithium-ion products; consult the manufacturer of your device for model-specific instructions.
See our guide to laptop battery repair and replacement for the safe next steps.
