While cleaning recently, I found four almost new AA Duracells that probably came out of my dad's blood pressure monitor after he died. I tested them, and they had a good charge, so I thought I'd put those in the AlphaSmart a little ahead of schedule. I took out the old batteries, and the tester was right there, so I figured, what the heck, let's see how they're doing? It was like they'd never been out of the package! FULL CHARGE, better than the Duracells. I put the old ones back in and continued typing.
You know I like this appliance; I've already said so. But it's pretty darned amazing when it comes to energy efficiency