Bob,
I noted you have a nice schematic on your page for a NiMH battery charger.
I'm trying to figure out the theory on these.  You seem to advocate having a
temperature sensor on the battery (this is possible, since my batteries will
be built in to the product)  and checking for excessive temperature rise.
Charge at a constant current, then quit at a fixed temperature rate of rise.
Not too tough, on the face of it.

Other sources I've seen seem to indicate monitoring battery voltage - when
the voltage doesn't rise so much for a constant amperage, you're charged,
and you can quit.

What's the pros and cons?

Some chargers go into trickle charging after this, but another site
recommends not using trickle charging, saying it shortens battery life.  Any
thoughts?


-- Lawrence Lile

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