iPad boot loop after battery replacement, works while on charge

Hello,

First of all, some context. My iPad Airs battery had been slowly reducing in capacity, often lasting for of an hour or less on a charge. I knew it was time for what I thought would be a simple battery replacement.

I wasn’t prepared to pay what Apple quoted me (£100+), so I got a quote for just over £50 from a local repair shop recommended to me by a friend. At this point, I just thought the battery needed to be replaced, as did the shop.

Upon collection, the iPad appeared to work fine, battery charged to 90%+, set up as new. I tried to install an app, but before I could enter my password, the iPad turned off. The screen then showed an Apple logo. And then turned off again. This repeated until I plugged the iPad in.

I took the iPad back to the shop, imagining the battery to be faulty. I was told that the problem was likely with the charge control circuitry and would be unecconmical to fix but convinced them to replace the battery again in case it was faulty.

Again, upon collection, it appeared to work fine. I went on holiday for two weeks, and left the iPad in airplane mode. The iPad lost just under 50% in those two weeks, and was still alive when I got back. I unlocked it, and again navigated to the App Store, only for the same problem to occur, before even trying to install anything.

What’s going on? Does this sound like it needs a motherboard level repair? I’m £50 in and no better off. Any suggestions are welcome and would be greatly appreciated.

Thanks,

Tyler