I am surprised by your experience. All wireless vendors honor the 1 year warranty and will replace the phone for swollen battery. Did you take the phone to your place of purchase have it looked at for proper assessment by qualified technician. This extra effort on your part will go a long way in helping you get a replacement.
It worked for me on my original phone. I did receive a replacement but the replacement also had the same problem. This time the purchase date was over a year old so no warranty in effect. I did not have the extended protection coverage so had to learn to fix it myself.
I have come to terms with the fact that we are pushing the boudaries of technology with these smart phones and batteries are a weak link so I have think hard spending for additional warrant coverage on my next phone, irrespective of the brand and manufacturer. Have to read the fine print as I am sure they will try to dodge ponying up on claims.
Exact same thing happened to me, the whole back case came off and there is a noticeable bulge on the edge of the battery. I thought about bringing it in but considering the chances of having to pay something and struggling to pay my rent I've just been keeping an eye on it.
But again, its definitely a battery issue and these phones came out around the time the "exploding note" did. Will Samsung be responsible for the cost of replacement or repair? If so, sign me up please; been dealing with this for a while. Happened a couple months ago right before a big move so it wasnt on my priority list. First the phone would get so hot it would burn my hand after extended use, however this shouldn't be an issues for a device that cost over 500$. Then the back panel started to separate from the heat reactivating the glue/ seal and eventually the back panel came completely off. The back is exposed and again. You can clearly see the faulty part of the battery. Please help.
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I just discovered this same issue on my S7Active last week. AT$T will do nothing because I don't have insurance. Why would I need insurance to cover what is an obvious manufacturer defect? I have already gone thorugh this BS with the Note 7 I bought for m girlfriend, and had the shattered camera glass replaced under warranty. Never had such issues with 4 previous Galaxy phones, but since they went to non-removable batteries it appears these issues are now rampant. Guess I have to get someone from Samsung on the phone, but I am not paying to replace or fix this defective phone and if they won't then I am not going to continue paying AT$T for it, either. I will cancel all my AT$T services (DirecTV, internet and 2 wireless accounts) and go with other companies. Been an AT$T wireless customer since 1998 and always gotten great service until I upgraded phones in 2016. Been nothing but trouble ever since.
I hate to hear that you are having trouble with your s7. You stated that it gets warm.