warning Misusing or mishandling a lithium-ion battery may cause a FIRE or EXPLOSION which can result in INJURY or DEATH. 
You MUST read the safety warnings and resources before purchasing, using, and/or handling batteries.

The rechargeable lithium-ion 20650 battery is an unusual size (between 20700 and 26650 batteries), giving it an advantage over 18650 batteries, while not taking up quite as much room as a 26650.  Before using 20650 batteries, check with your device manufacturer for compatibility.

20650 Batteries

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