Anyone have any luck with rechargeable batteries in their game cameras?

I picked up 8 new Energizer 2450mAh batteries for my SG550. After throwing a full charge on them, I ended up with dead batteries after 7 days and only 15 one minute videos.

I was using standard Duracel or Energizers before. I don't recall exactly how long they lasted, but I know I was rarely changing them.

I thought the rechargeables might be a good way to save a few $$$. Maybe an external would have been a better option.