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I'm picking you will get better results with the new set, there are counterfeit ones around too so make sure you don't end up with those!
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If you have even one dud cell out of the four and it starts to fall off during high current draw the camera will end up turning off much too early. The LSD's batteries are pretty good generally for our cameras as backups though, I've got a cheapo yet reliable 2100mah set from dealextreme and I like 'em just fine.
Not sure how many shots to a charge yet, haven't really bothered checking.