If you are trying to get longer battery life in a iPhone, you can get aftermarket batteries with higher capacity. Just be really careful because there are a lot of fakes that will claim the mAh is some crazy number, but it isn't accurate. Loctus is a pretty good brand I think. [link|https://www.ebay.com/itm/303324351442?hash=item469f8a4bd2:g:KpIAAOSwFZtgINIb&amdata=enc%3AAQAHAAABAKZeQNoeS6YZGIHN8NcVKSNX5JnexispJsPwS6haSwvktSlwAcpOjbnYYNcz58hw5MCOcpIJywAq4zVmk%2FE41VebDThqDR%2FTRsGPa9erbOEh2mR3t95fLpyipIevNfoyJkbGpJ%2Bu53nWwHXKQbteVwN0FgXvrWl5MNFaciQYFAUcN6ViiTF8CaUWC2gvwEO67AQq0ADcp3ou47N%2B6kz%2FMHPFTG5GyKGZJVVzcxYYcz3ZzZmholb1%2B6JsrkJctkbxo5tuj1Q%2FR3MzITDM8TnB%2Bvk2R1nnAp4srf4bcxevfp4SiNG2yPaKOb8EJzfVhKWoObHDv5pGEL5dPFUcU5Bi0b8%3D%7Ctkp%3ABFBM1sDGh-Ng|Here|new_window=true] is the link to a Loctus battery with 2210 mAh. The original/normal one for the iPhone 8 is 1,821mAh.
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If you are trying to get longer battery life in a iPhone, you can get aftermarket batteries with higher capacity. Just be really careful because there are a lot of fakes that will claim the mAh is some crazy number, but it isn't accurate. Loctus is a pretty good brand I think. [link|https://loctus.com/collections/battery-for-iphone/products/battery-for-iphone-8-2100mah-high-capacity|Here|new_window=true] is the link to a Loctus battery with 2210 mAh. The original/normal one for the iPhone 8 is 1,821mAh. [link|https://www.ebay.com/itm/303324351442?hash=item469f8a4bd2:g:KpIAAOSwFZtgINIb&amdata=enc%3AAQAHAAABAKZeQNoeS6YZGIHN8NcVKSNX5JnexispJsPwS6haSwvktSlwAcpOjbnYYNcz58hw5MCOcpIJywAq4zVmk%2FE41VebDThqDR%2FTRsGPa9erbOEh2mR3t95fLpyipIevNfoyJkbGpJ%2Bu53nWwHXKQbteVwN0FgXvrWl5MNFaciQYFAUcN6ViiTF8CaUWC2gvwEO67AQq0ADcp3ou47N%2B6kz%2FMHPFTG5GyKGZJVVzcxYYcz3ZzZmholb1%2B6JsrkJctkbxo5tuj1Q%2FR3MzITDM8TnB%2Bvk2R1nnAp4srf4bcxevfp4SiNG2yPaKOb8EJzfVhKWoObHDv5pGEL5dPFUcU5Bi0b8%3D%7Ctkp%3ABFBM1sDGh-Ng|Here|new_window=true] is the same product, but on eBay.
I definitely wouldn't try to put a iPhone 7 battery in a 8 and vice versa.
If you are trying to get longer battery life in a iPhone, you can get aftermarket batteries with higher capacity. Just be really careful because there are a lot of fakes that will claim the mAh is some crazy number, but it isn't accurate. Loctus is a pretty good brand I think. [link|https://www.ebay.com/itm/303324351442?hash=item469f8a4bd2:g:KpIAAOSwFZtgINIb&amdata=enc%3AAQAHAAABAKZeQNoeS6YZGIHN8NcVKSNX5JnexispJsPwS6haSwvktSlwAcpOjbnYYNcz58hw5MCOcpIJywAq4zVmk%2FE41VebDThqDR%2FTRsGPa9erbOEh2mR3t95fLpyipIevNfoyJkbGpJ%2Bu53nWwHXKQbteVwN0FgXvrWl5MNFaciQYFAUcN6ViiTF8CaUWC2gvwEO67AQq0ADcp3ou47N%2B6kz%2FMHPFTG5GyKGZJVVzcxYYcz3ZzZmholb1%2B6JsrkJctkbxo5tuj1Q%2FR3MzITDM8TnB%2Bvk2R1nnAp4srf4bcxevfp4SiNG2yPaKOb8EJzfVhKWoObHDv5pGEL5dPFUcU5Bi0b8%3D%7Ctkp%3ABFBM1sDGh-Ng|Here|new_window=true] is the link to a Loctus battery with 2210 mAh. The original/normal one for the iPhone 8 is 1,821mAh.
I definitely wouldn't try to put a iPhone 7 battery in a 8 and vice versa.