I suppose I should have specified when I was speaking of rechargeable I mean built into the device. For AA/AAA I've always used rechargeable. I bought a set of Sanyo 1650mAh NiMH around the year 2000 and used those until they came out with Eneloops and then moved to Eneloops and gave those pre-eneloop 1650mAh to my son who would use them several year after.