Replacement Lithium-Ion (Li-ion) rechargeable battery for iOptron AZ Mount Pro mount. Use the iOptron 4400mAh Lithium-Ion Battery as a replacement or a spare to keep your AZ Mount Pro mount operating at peak performance. This battery is identical to the one that originally shipped installed in the mount, with six 18650 batteries bundled together to produce 4400mAh capacity. Warning: Li-ion battery is very sensitive to charging characteristics and may explored or burn if mishandled Charge only use a charger designed for this battery Do not charge the battery below 0C Do not dispose in a fire Disposal the battery according your government regulation Specifications Battery type: Lithium-Ion rechargeable battery, 6 X 18650 Capacity: 4400 mAh Output voltage: 11.1V (peak at 12.6V) Dimensions: 2.75"X2.15"X1.5" (68 X 55 X 38mm) Weight: 10.2 oz (290g) Charging voltage: 12.6V Warranty: 30 days limited