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General rule for charging NiCd & NiMH batteries
Assuming the battery is in a fully discharged state (1V per cell), calculate the charge time in
Hours for a Nickel Cadmium (NiCd) or Nickel Metal Hydride (NiMH) battery pack using the following
formula:
| Charge Time Applicable in Hours = |
Capacity (C) rating of battery in (mA) x 1.4
Output current in (mA)
|
In general, for standard charge you need to put up to 140% energy in to obtain 100% energy out
of your batteries.
For fast & rapid charge techniques this figure of 1.4 (140%) may need to
be reduced by up to 15%. This is dependant on your charging parameters and charger termination method.
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