If your iPhone battery isn't holding the charge as it used to, you can reset it to see if that fixes the problem. To reset the iPhone battery:
How To Reset Iphone Lithium Ion Battery
Make sure your iPhone is turned off.
Make sure your battery is exhausted
Wait until the iPhone battery is completely discharged and then recharge it to reset the iPhone battery
How To Maximize IPhone Battery Life?
There are a few things you can do to maximize your iPhone's battery life. First, make sure you're not using any apps that drain your battery. You can check this by going to Settings > Battery. If you see an app consuming a lot of power, try closing or deleting it. You can also turn off location services for apps you don't need.
How To Extend IPhone Battery Life?
There are a few things you can do to extend your iPhone's battery life. One is to make sure you're not using any unnecessary features, such as location services or Bluetooth. You can also turn down the screen brightness and disable automatic downloads. You can also turn it off completely if you're not using your phone.