Time will tell, I guess.

I'm not completely sure if I understand the problems you've had but if your original batteries are bloating, you have a pretty serious problem and I would NOT look at a third-party battery to solve it. I'd contact Apple and go from there. Also, if it's not a model known to have this kind of problem, wrack your brain to see if you can figure out if there's an environmental issue. (E.g., something like the locker you leave it in when you go to the gym in the morning is actually in direct sunlight at the time you go in the season when you had the problem. Not to let Apple off the hook, just pointing out that if you've had two swollen batteries for a model of phone not known to suffer from that, then the easiest solution could be something more proximate to you.)