We still have an IPad Air 2 that works well, but the battery broke a few weeks ago, so you could not even turn on the ipad on the power cord.

We ordered a battery on the internet and opened the IPad with the help of a Youtube video. The glue still holds very tight after all these years ;-). We took a deck of cards to open the Ipad easier.

Replacing the battery is relatively simple once you have opened the iPad. You have to loosen a few screws, disconnect the flex cables and disconnect the display. Then you have to get the battery out of the iPad.

Closing the iPad was very simple, no new glue was needed, the old one still worked.

Unfortunately, I went under the display with a card when opening, now there is a small glue stain. Annoying.

In conclusion, it is a good alternative to the replacement in the Apple Store, as long as you are more careful than I was when disconnecting the display.