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A lithium-ion 21700 battery with a capacity of 5000 mAh. Its output voltage is 3.7 V. It has a flat “+” contact and does not contain a protective plate.
The battery can be recharged 500 times.
Technical data
Model: 21700 Li-Ion
Capacity: 5000 mAh
Voltage: 3.7 V
Number of charging cycles: 500
Dimensions: 70 x 21 mm
Manufacturer: Armytek, Canada