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Many refer to these as the purple battery.  The Efest 18650 35A rechargeable battery.  They are safer chemically than Li-Ion batteries and do not need a protection circuit. These cells can handle high amperage and are safe in series or in parallel. They can be charged with any Li-Ion battery charger with an output of 4.2V. These have a flat top. They are 3.7V batteries with a typical capacity of 2500mAh.  Battery cover may vary but the batteries are always high quality and accurately rated.

Specifications:

• Battery Size: 18650
• Capacity: 2500mAh
• Min. Capacity: 2400mAh
• Nominal voltage: 3,6 – 3,7V
• Charge voltage: 4,20V ±0,05
• Discharge voltage: 2,75V
• Max discharge current: 35A (14C)
• Positive pole: Flat Top
• Protection circuit (BMS): no (unprotected)
• Diameter: 18,40mm ± 0,1
• Height: 65,25mm ± 0,2
• Weight:48g ± 1
• Charging methode: CC-CV

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