When to Change Your iPhone Battery

Third-party iPhone batteries are a murky gray area at best. Third-party batteries from established brands with good support networks are probably safe enough. Generic batteries of unknown provenance? They can be downright dangerous.

That’s not the only factor to consider, either. iPhones are tricky to open and work on. With Apple’s very reasonable replacement prices these days, it’s probably worth spending the small price difference and having the original manufacturer poke around your phone’s insides. Given how little money it wold save you, third-party battery replacements are probably not worth it.

Signs of Battery Replacement Need

There are a few telltale signs your iPhone battery may be wearing down and requires replacement:

  • Unexpected shutdowns: Your phone may unexpectedly shut down, even when it seems like there’s plenty of battery life remaining.
  • Slow charging: It takes longer than usual to charge your iPhone, or the battery drains quickly after being charged.
  • Dim screen: The display on your iPhone is dimmer than usual, even when the brightness is turned all the way up.
  • Works only when plugged in: If your phone only works when it’s plugged in and won’t hold a charge, this is a sign the battery needs to be replaced.

What does Maximum Capacity percentage mean?

Essentially, this percentage indicates how many times your iPhone has gone through recharge cycles. So what is a charge cycle? A charge cycle does not mean that you charged your iPhone from 0% to 100%. Here is what Apple says:

Apple lithium-ion batteries work in charge cycles. You complete one charge cycle when you’ve used (discharged) an amount that equals 100% of your battery’s capacity — but not necessarily all from one charge. For instance, you might use 75% of your battery’s capacity one day, then recharge it fully overnight. If you use 25% the next day, you will have discharged a total of 100%, and the two days will add up to one charge cycle. It could take several days to complete a cycle.

Sluggish iPhone

Sometimes, if your phone battery is weak, your device won’t function fast. iPhones have unique features that need a lot of power.

So, if the battery is weak, the iPhone will lag while handling most tasks. Giving your iPhone a new battery will be a fantastic boost.


While your iPhone’s battery starts degrading visibly after reaching 80 percent of battery health, it doesn’t necessarily mean you should get a new one. If the device still holds a sufficient charge to power you through the day, keep using the same battery. Replace it when you notice major performance issues or the device becomes unusable.

At what percentage of battery health do you usually replace your iPhone’s battery? Let us know in the comments below.

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