[time-nuts] HP 105B: Modern replacement for NiCad battery pack?

[Mark Sims]

Since NiMH cells typically have over twice the capacity of NiCad cells, a C/10 charger will charge them at less than C/20.    It's best to trickle charge NiMH cells in the C/30 to C/40 range, but depending on the cell C/20 might be OK.   Measure your charge current on a discharged pack and calculate the C rate.  Tweak the charger supply for a C/30 to C/40 rate.

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NIMH is not necessarily a drop in. While it will work fine in the short term, crude chargers that implement constant trickle like C/10 can be (emphasis) tolerated (/emphasis) by some NIMH cells, and totally out of spec for others.