Since purchasing these batteries a few years ago, the only concern I had was the massive price tag. It seems now they're a lot cheaper than they used to be, and so what could have been a disadvantage has changed. I was considering writing they're quite expensive as the disadvantage, but I noticed the price is much lower than the amount I paid for them. I got mine to power a large Microsoft Intellimouse, a Logitec notebook mouse, a Microsoft mobile mouse, and a few household items, including clocks and other items. I bought several packs of these batteries, each a pack of four. The life on each recharge appears to vary, depending on which items the ...  Read the complete review