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Old 21 June 2016, 14:38   #72
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Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 1,043
I'd avoid NiCd as it is certain to leak sooner or later. NiMH batteries rarely leak unless they're abused. The third leg is generally for stability, yes, though two legs should be fine. It's also possible to replace the battery with a non-rechargeable lithium cell by fitting a diode to protect it from charging current. Small adaptors with a footprint matching the original battery can be bought from the usual sources.
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