We can’t survive without our smartphones in the modern world, so the battery life is probably the priority feature we need to pay attention when we get a new phone. It seems a trend that the battery capacity of Android phones are getting huge, like Samsung sports giant 4100 mAh on Galaxy S10+, while Apple didn’t upgrade much on the pricey latest models, iPhone XS Max features only 3174 mAh, plus Apple had a bad history on throttling the battery life by upgrading the iOS on old iPhones, how to tell when you need to replace your iPhone battery?
The battery life of your iPhone mostly depends on how heavy you usually use it, if your iPhone is pretty old and you often use it for gaming or watching videos, then most likely there are a large number of charge cycles on your iPhone battery, it’s time to replace it for good. To be specific, first you’d better check the current battery health situation then decide whether you need to replace the whole battery. For iPhone 6 and later, iOS 11.3 and later add new features to show battery health and recommend if a battery needs to be replaced. These can be found in Settings > Battery > Battery Health.
The Battery Health screen includes information on maximum battery capacity and peak performance capability. Maximum battery capacity measures the device battery capacity relative to when it was new, a normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions. If your iPhone battery health had dropped under 80% in one year, it might be a defective battery pack on your iPhone and the warranty will cover the fee of battery replacement.
If your iPhone is out of warranty and the battery health condition is really bad — lower than 80% or even worse, however if it’s already old and slow you can directly get a new phone instead of only replacing the battery. The smartphone industry is following a trend with high price tag, if you have a limited budget and the performance of your iPhone is still solid, you can either go to an Apple store around the corner or head over to iFixit and navigate through their site to Repair Guides / Phone / Apple iPhone model to replace the battery on your own. Personally I would not suggest you to do it yourself without any background knowledge on electronics, typically it may cause irreversible damage.