Ni-Cds have good performance in high-discharge and low-temperature applications, but are subject to the problem of “memory effect” (the cell remembers and maintains the characteristics of the previous cycle). They will also self-discharge at a rate of about 1% a day. Sanyo and Panasonic offer good quality NiCds.
NiMHs closely resemble the NiCds in construction but can offer 30% more capacity and about 25% more power than the NiCd counterparts. The problem is that they have poorer service life, tend to self discharge faster, and in certain cases are subject to “memory effect” (refer to the troubleshooting section for further information). GP offers very good quality NiMH cells.
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