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is that even recommended? alkaline batteries? i thought they needed to be rechargeable since voltage runs through the batteries?

There's a blocking diode. No reverse charging.![]()
then how do the original rechargeable 3.6v phone batteries keep its voltage without charging?
you don't want lithium on Defender. I made that mistake. it drains the battery cells really really fast.
you can keep AAs, just get one of the remote battery holders like on pinball.
or you can probably do one of those NVRAMs.
Do the NVRAM upgrade! !!
NVRAM is a must..No more leaky battery's! [emoji4]Another vote for NVRAM. Well worth the money http://nvram.weebly.com
It looks like this guy has sold a lot of these.
http://www.ebay.com/itm/Defender-Ar...997675?hash=item2ef5b863ab:g:eh4AAOSwbYZXWHHc