@Maggio040 Link below is to start the battery replacement process. I had my iPhone 6 Plus replaced. They sent a box and shipping label. Took about a week for the complete process. If the iPhone is out of warranty try Googling battery replacement shops near your location. Most of the time the shop will be cheaper.
Award for Community Excellence 2019 Achiever* *The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.