You can replace the battery. The removal is a bit frightening (there&#x27;s a shit-ton of glue so you&#x27;re tearing the battery apart to get it out), but aside from that it&#x27;s a 10mn~15mn job (first time, being careful), did that on my own 4S. Biggest annoyance (aside from fear of piercing the battery while you&#x27;re tearing it out) is some sort of pressure&#x2F;spring-loaded contact inside which is a pain to get back in place.<p>ifixit sells complete replacement kits (battery + plastic forcing tool + pentalobe driver + replacement philips screws) for $25, or just the battery for $20, you can probably find even cheaper parts elsewhere.<p>Phone resurrected, money well spent.