True... I got caught up in making sure I was typing "mAh" when needed and forgot to leave the "h" off when it wasn't needed.
As I understand most cases, the charger determines the applied voltage and current - though chargers can be completely "dumb" if the battery is "smart"... or both, or vice versa.
Hmmm... Maybe' that's part of the problem with the Mega PCC, if it's quasi-smart. I seem to recall Imagine saying the Volt batteries would shut off their own charging when the cycle is complete; is there a chance the "smarts" of the PCC and the battery just weren't working together very well? It might come to nothing but I wonder what the current output of that PCC would be with a completely "dumb" unregulated battery... or if the "smarts" of the PCC were bypassed and the Volt battery was in left in charge of its own cycle.
Regardless, I was assuming the Volt batts were 3-cell NIMH which
should be able to take up to 1C as long as charging time is controlled, but I haven't had the heart to take apart a working battery to find out.

But anything C/2 or lower should be fine given correct voltage and enough time.