bought this charger for a sony w580i. it fits the phone on the side, so that's a little goofy, but you still have functionality when it's plugged in. cover is handy though if you put it battery mode with no batteries in it, it's a little tough to remove. when putting in AA batteries it's a bit of a tight fit, but i guess this is to hold them in place. i first thought i had the wrong size. also i now realize the batteries probably help you open the cover.noticed that the batteries got really hot when they finally went dead. a set of fresh batteries are good for about a 3 to 4 hour charge (about one and a half full charges by my estimate for the battery on the w580i). there is no warning when the AA batteries are dead, so you'll have to check periodically to make sure your phone is still charging.