If you don't want to pay for another iPhone upgrade, learn how to maximize your battery's lifespan.
https://www.cnet.com/tech/mobile/holding-on-to-your-iphone-for-as-long-as-possible-make-sure-you-keep-your-battery-healthy/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e
https://www.cnet.com/tech/mobile/holding-on-to-your-iphone-for-as-long-as-possible-make-sure-you-keep-your-battery-healthy/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e