My iphone4S battery is only 7 1% healthy. What should I do?

Don't worry about him, these so-called battery management software are simply unreliable. Batteries are consumables, and wear is normal. The warranty does not care about battery wear. Just use it normally, charge it normally, and don't overcharge or overdischarge it. When the battery is completely dead, just open the back cover and replace it. Of course I won't change myself? You can also take it to the repair shop to exchange it. ?