I have an iPad Air which is either 2.5 or 3.5 years old. The battery claims to be 100% charged, but then dies after (literally) about three minutes of use. If I plug it in, it claims to be 100% recharged after about ten minutes. I suspect it is a battery problem; I took it to my local Apple place, and they said Apple could replace the battery for about £100.
My question is whether it's better to replace the battery, or whether I would be better buying a new iPad. I really don't want to do either due to lack of funds, but don't have any other device (no phone etc). It would obviously be better to spend £100 rather than £400, but would it be a complete waste of money? My teenagers tell me that Apple stop supporting devices after a certain point...