Battery Specifications:

1. Capacity (Ah): 3.4 Ah ( 2500mAh)
2. Charging Voltage (V): 4.2 V
3. Energy (Wh): 12.2 Wh
4. Energy Density (Wh/L): 730 Wh/L
5. Nominal Voltage (V): 3.6V-3.7V
6. Weight (g): 46 g
7. Diameter (mm): 18.06 mm (+/- 0.03 mm)
8. Height (mm): 65 mm (+/- 0.03 mm)
9. Max. Discharge rate: C Rating 2C (Maximum recommended current 6.8A)
10. Top (positive side): Flat top
11. Model: NCR18650B

NCR18650B Datasheet Specifications

Important:

1. Never completely discharge the lithium battery ( below 2.5V under load ).
2. Charge fully to 4.2V before first use.
3. Never use force to install (insert) a li-ion battery.
4. Do not use old and new battery cells together.
5. Use only high-quality battery chargers.
6. Do not be exposed to heat.
7. Do not short (connect) positive (top), and negative (bottom) battery terminals (contacts). Keep a battery that is not in use in a plastic holder (or any insulating [plastic] container).
8. Never charge the battery over 4.25V (another reason to use a high-quality battery charger).
9. Do not charge unattended.
10. Do not use old, and new cells together.
11. Do not store your li-ion batteries fully charged (for an extended period of time).
12. Store in a cold and dry place at approximately 3.7V (storage charge).
13. After the battery is discharged-don’t leave it discharged=>charge it as soon as possible.

You must carefully read, and comply with the safety instructions and precautions in this safety Instructions guide before charging and using your battery.
Failure to read, and follow Li-ion safety instructions, and warnings may result in fire, personal injury, and property damages if the battery is charged and/or used improperly.