Chosen Solution
After the battery in my iPhone 3G failed, I ordered a new one (from iFixIt, natch) and promptly installed it. The iPhone booted and the battery appears to be half charged. When I plug the iPhone into power (Apple cable, Apple charger) I get this dialog: “This accessory is not made to work with this iPhone - Do you want to turn on Airplane mode…” …and the iPhone doesn’t charge (no lightening bolt on the battery icon). Did I goof something on the battery install? Or is this a sign of another problem with the iPhone? Thanks for any help!
Take a look at this. Apologies for the image rotation but i couldn’t be bothered rotating it. On the bottom is a 3GS battery and on the top a 3G. You can tell the difference by looking at the voltage (circled). If you replace an iPhone 3G battery with a 3GS battery and vice versa, you will inevitably have issues with the overall functionality of the phone.
Try redoing the installation.
Are you sure you got a 3g battery and not a 3gs battery as they are different, It’s a common mistake.
