18650 Li-Ion battery, commonly used in LED torches.
Specifications
DC Voltage: 3.7V
Dimensions: 65 x 18 mm
UN Number: 3480
Battery Chemical Composition: Lithium Ion
NOTE: For shipment by road transport only.
NOTE: This is an unprotected rechargeable lithium battery (Li-Ion or LiFePO4) which is only suitable for use in a compatible device/charger.
Use of a unprotected cell where a protected cell is expected is very dangerous, please review your product's user manual before proceeding.