Mon 22 Jan 2007
After snooping around, I was able to find some good information on the Panasonic OEM battery website for both NiCd and NiMH battery types. The basic idea is that you supply a constant current based on the rated battery capacity and you stop when the battery is full. The charging guides for NiCd and NiMH batteries outline the methods used to determine when the battery is full, most of which track the cell voltage or change in voltage for a given temperature. They also explain why the really cheap chargers, the ones that are nothing more than a DC supply with a series resistor, have a tendency to damage the internal battery electrodes and cause something that is sometimes referred to as “memory effect”.
( panasonic_nicd_chargemethods.pdf ) ( panasonic_nimh_chargemethods.pdf )
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