The Tempest T-LP1 2000mAh Lithium-Polymer rechargeable battery is compatible with all Tempest Beltpacks. One T-LP1 battery comes standard with each Tempest Beltpack.  Under normal operating conditions the battery should last in excess of nine hours.  The battery is equipped with onboard fuel gauge technology that ensures that the battery level indication on the Beltpack is as accurate as possible at all times.  The battery comes with onboard protection circuitry to protect against overcharge and overdischarge conditions
Specifications
Rated Capacity                               2000 mAh typical
Nominal Voltage                              3.7 VDC
Charging Method                             Constant Current + Constant Voltage
Max Charge Voltage                        4.20 VDC
Max Continuous Charge Current       1000 mA
Rec Charge Cut-off                         40 mA or 5 hours
Max Continuous Discharge Current 2000 mA
Rec Discharge Cut-off                     3.0 VDC
Internal Impedance                         Approx 20 meg ohms
Expected Cycle Life                       > 500 cycles > 70% of initial capacity (0.5C/0.5C)
Over-charge Detection                    4.275 VDC ± 25 mV 0.5 to 1.5 sec delay, resume @ remove charger & discharge current
Over-discharge Detection                2.300 VDC ± 58 mV 10 to 30 msec delay, resume @ charging current
Over-current Detection                    2.3 A to 3.3 A (4 to 20 msec delay)