Preliminary Specification
1.General:
Battery with safety circuit and wires
Cell: HPL701838 440mAh 3.7V
PCM: Seiko IC is available
NTC: 10 kOhm or 100 kOhm (available)
Configuration: 1S1P
Weight: approx. 9g
2.Electrical Specification:
Rated Capacity: 420 mAh min, 440 mAh typical
Nominal Voltage: 3.7V
Watt-hour rating: 1.85 Wh
Charging Method: Constant Current + Constant Voltage
Max. Charge Voltage [V]: 4.20 (±50MV)
Max. Continuous Charge Current: 440 mA
Rec. Charge cut off: by current 8.8mA or timer 2.5h
Max. Continuous Discharge Current: 440 mA
Rec. Discharge cut off: 3.0V
Internal Impedance: tbd
Exp. Cycle Life: 400 cycles ＞ 80% of initial cap. (1C at 20ºC)
Cell protection
Overcharge Detection: 4.35±0.025V
(0.5 to 1.5 sec. delay, resume 4.15±0.05V or at discharging current)
Overdischarge Detection: 2.30±0.05V
(0.1 to 0.2 sec. delay, resume 2.90±0.1V)
Overcurrent Detection: 0.88 A to 1.1A (5 to 30msec. delay at discharge)
3.Ambient Conditions:
Temperature Range
-Charge: 0 to +45ºC
-Discharge: -20 to 60ºC
-Charge Retention/Storage[%]: 1 year at -20 to +25ºC
3 month at -20 to +45ºC
Humidity: 65±20%RH
4.Environmental and Safety:
Please follow Hypercell Handling and Safety Precautions for Li ion and Li polymer
The cell is approved according UL 1642.
This battery meets the requirements of Battery Directives, and the battery parts are RoHS-Compliant.
