July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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242
21.3 Rechargeable batteries
21.3.1 Lead acid batteries
Lead acid batteries, whether of free electrolyte or low-maintenance
sealed construction, have a nominal terminal voltage on load of 2.0 V
per cell. This voltage falls on load in a gradual curve, shown in
Figure 21.2, until the discharged voltage of between 1.75 and 1.85 volts
per cell is reached.
0123456 78910
1.7
1.8
1.9
2.0
Cell
voltage
Discharge time (hours)
Figure 21.2 Typical lead acid cell discharge characteristics
A discharged battery will, because of its inefficiencies, require
a recharge equal to the amperes × hours discharged +11%,e.g.a
cell discharged at 5 amps for 10 hours will require a recharge ...
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