Psion Inc 7505BTHC25 用户手册

Cell Configuration

2P1S (2 parallel connected cells)

Cell Type

Cylindrical

Maximum discharge current

5.0A (1C) -20°C to +60°C (-4°F to +140°F)

Charge algorithm

Constant - current / constant voltage with taper current & timeout termi-
nation

Maximum charge voltage

4.2V +/- 1%

Maximum charge current

1C - dependant on cell manufacturer

Discharge cutoff 

2.7V min - safety circuit initiates

Recommended fast charge

1C for 2.5 hr - dependant on cell manufacturer

Maximum fast charge time

2.5 hr

Recommended termination taper 
current

100 - 250 mA

Recommended charge termination 
timeout

4.0 hr - charging must stop

Charge temperature

0°C to +40°C (32°F to +104°F)

Discharge Temperature

-20°C to +60°C (-4°F to +140°F)

Storage Temperature

 -20°C to +50°C (-4°F to +122 ºF)–storage at elevated temperatures not 
recommended
25°C (77 ºF)–recommended storage temperature.

Cycle Life

300 cycles minimum with no degradation below 80% of nominal capac-
ity based on 1C charge / 1C discharge rates (to 3.0V) @ 25°C (77 ºF)

Impedance

100 m  max. @ 1kHz AC, fully charged cells

Total Internal Resistance

180 m  max., fully charged new pack (including cell resistance and pro-
tection circuits)

High temperature recovery

> 55% nominal capacity after 20 days @ 60°C (140°F) (full charge)

Low temperature recovery

> 80% nominal capacity after 72 hours @ -20°C (full charge)

Capacity recovery

-20°C to +60°C (-4°F to +140°F) > 80% capacity recovery within 1 
month
-20°C to +45°C > 80% capacity recovery within 3 month
-20°C to +20°C > 80% capacity recovery within 1 year

Description

Specification