How to Charge and Store 18650 Batteries Safely

Quick answer: Use a charger designed for the cell chemistry and format, inspect every cell before charging, keep terminals isolated during storage and never charge unattended on a bed, sofa or other combustible surface.

Charging practices

• Use a compatible smart charger.
• Check cell wrapping and terminals first.
• Place the charger on a stable, dry, non-combustible surface.
• Keep the area ventilated and observe the charging process.
• Stop if a cell becomes unusually hot, leaks or smells abnormal.

Storage practices

Store cells in individual cases or a purpose-designed holder so terminals cannot touch metal objects. Keep them dry, away from children, direct sun, heaters and temperature extremes. Do not mix cells with different ages, capacities or conditions in a multi-cell device unless the device manufacturer permits it.

Relevant products

• Smart USB 18650 battery charger
• 18650 batteries with smart charger
• 18650 battery collection

FAQs

Can loose cells be carried in a pocket?

No. Coins and keys can short the terminals. Use a protective case.

Can a torn wrapper be ignored?

No. Stop using the cell and obtain appropriate assessment or disposal guidance.

Safety: Never use damaged, wet, swollen, leaking or overheating cells. Follow charger and device instructions.