These TrustFire batteries (sold as single units) are rated at a massive 3000mAh capacity and have a Protection Circuit Board built in and may not be suitable for Variable Voltage Devices.
This is a protected Li-ion battery that provides over charge protection, and controls discharge rates.
It has a positive nipple (vented) and is slightly longer than most 18650 batteries at 68.5mm in length (including nipple), the diameter is also a touch oversize at 18.3mm.
Type: Li-ion (Lithium ion)
Postive vented pole type.
Warranty: 30 Days for manufacturing defects, exludes ALL batteries with any signs of damage or other misuse.
As with any battery, please handle, use and store with due care.