- The voltage of full charge and cut-off discharge is 4.2V and 2.75V - Don't heat, incinerate or reverse polarity - Environmen Item: TrustFire Protected 18650 Lithium Battery (2500mAh 2-Pack Blue) Dimensions: 6.5 cm x 1.7 cm x 1.7 cmWeight: 3.39 oz

Picture (for your reference)

Ultrafire Rechargeable 3000mAh 18650 Battery