Hello Apple pros, Long story short, my iPhone 4s was sitting unused for a week on a shelf, and when I checked it to see if it needed a charge, it was swollen. The back and display split from the body. Apple wants me to pay 30 euros (I could find a 4s for 45 euros) which is too much, so I will replace the battery myself. I can get a genuine apple battery from ebay, but are there any non genuine ones that are better? Surely there are some with newer tech and more mAh stuffed into the same size? Thank you for your suggestion.