There are a lot of smart minds here so I thought I'd check with you all.  I 
am interested in building a magnetometer.  I know that manufacturers 
commonly use Gel Cell batteries because they are non-ferrous and won't 
interfere with the mag.  With the power capacity to weight efficiency gain 
with using a Nimh battery pack, I'm trying to find out if they are ferrous 
or not.  Are there any battery experts here that know the answer?
Thanks,
FJ


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