Lowes, just had the Utilitech (their brand ) of AA batteries 30 pack for $ 4 for Black Friday thru cyber Monday, I got 2 packs, we use them at work in game cameras which are used for low tech surveillance cameras till we get a budget next year ....almost everything I have read about IR game cameras is that they are high drain devices, I have had several sets of 8 batteries going for about a month at a time, we are talking about 2000 30 second videos, plus running the IR stuff at night.....I can't produce any scientific comparison, but I'd say they last as long as copertops which sell for quadruple for a name brand ....YMMV