I would only stress one thing and that is to get a GOOD NiMH charger (not a Nicad charger!) and use it. Overcharging NiMH batts will kill them with only 45-50,000 miles on them. If you use a good charger and don't overdo the occasional conditioning bit you can expect 200,000 miles, to mix metaphors. In my experience, too much of anything is MUCH worse than too little when speaking of NiMH cells. Good luck.
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but tell me, how is a NiMH charger different from the NC charger ? Strangely, Hasselblad claims their standard (NC) charger can be used on the NiMH units they now sell as replacements ( for a lot of money ! ) without complications. And the more I browse the internet for charging info on NiMH cells the more confused I get !