I recently wrote this guide to lipo batteries. In it, I discuss:
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Before you use or charge any lithium battery you must read the Lithium Battery Saftety Instructions and Warnings document.
Do not charge or use batteries if the battery ...
is punctured or damaged
is bloated, expanded, swelling or otherwise deformed
has any cell with a voltage of 3.3v. This means less than 9.9v for a 3-cell/11.1v battery.
Do not charge batteries unattended. Monitor batteries during charging for popping, hissing, smoke, sparks or fire. Also monitor the battery for any swelling or other deformities. Disconnect the battery from your charger immediately.
Do not charge batteries near flammable material. Charge batteries in a fireproof container. Do not charge batteries while they are in your robot.