As those of you in the US may be aware, the chain Radio Shack is downsizing and closing many locations. The closing locations-at least in this area-are currently in the process of liquidating their inventory. I've been recommending this battery for a while as a replacement PRAM battery. It is an exact, drop in replacement, and I've used quite a few of them. Although it's not cheap, it as the advantage that at least in most locations in the US, you can walk into the store and buy one http://www.radioshack.com/saft-ls14...-lithium-battery/2301243.html#q=1/2aa&start=1 Radio Shack also sells this battery, which is labeled as a 1/2 AA(and has the same wrapper as many of the Apple batteries I've seen) but is lower capacity than the above and twice is expensive. http://www.radioshack.com/radioshac...-lithium-battery/2302197.html#q=1/2aa&start=5 Both of these batteries are correct for any Macintosh which calls for a 1/2 AA PRAM battery. I've seen them used in desktops as old as my Macintosh SE and as new as my G5 tower/Xserve(although the late '05 G5s use a different battery). Basically, it's likely correct for most any pre-2005 Macintosh desktop. With store liquidations in progress, you can pick up these batteries at serious discounts. One store local to me is running batteries at 70% off currently, so I picked up 5 of the Safta brand batteries(all they had in stock) for $3 each this morning. That's about as inexpensive as I've seen them, even on line, and this is a good quality battery. If you have a Radio Shack closing locally, I'd recommend checking this out. Even the "proper" 1/2 AAs can be very inexpensive when discounted as deeply as stores currently are.