Re: DECT batteries
If originally designed for NiCad battery technology, the charging system may not be appropriate for NiMH. Smart charging needs a more sensitive endpoint detection for NiMH, since NiMH generally have a flat delta-V endpoint rather than a dip. Dumb trickle charging is probably equally poor for both technologies.
Not sure if you can still get NiCad, I thought they were banned now, though a few places still seem to have them.
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