1, mainly depends on whether the use time and battery life of ipad affect daily use;
2. Generally speaking, the design life of lithium battery is about 500 cycles. Generally speaking, after charging for one day, you will feel that the power will drop significantly after one and a half years.
Generally speaking, it is normal that the battery health of iPhone is between 80% and 90% after using the mobile phone for one year. If the battery life of your mobile phone does not particularly affect your daily use, you don't need to replace the battery. It is 95% new, because if the battery is less than 80%, it will reach the scrapping standard. When I say "how much is new", I mean the appearance. The battery is just added. Generally, 90% of batteries have been used for more than one year, and mobile phones are basically about 95% new.