iPhone is by designed made to deliver simple user experience. This is only possible through a combination of advanced technologies and sophisticated engineering. One important technology area is battery and performance. Batteries are a complex technology, and a number of components contribute to battery performance and related iPhone performance.
All rechargeable batteries are consumables and have a limited lifespan – eventually their capacity and performance decline such that they need to be replaced. Battery aging can contribute to changes in iPhone performance. The tutorial above helps in replacing your battery.
If you do not have enough technical knowledge to perform the above procedure, we recommend that you do not partake. NB: YOU PARTAKE IN, AT YOU OWN RISK.