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iphone 7 gets hot and needs frequent charging despite new aftermarket battery
iPhone 7
I believe you answered the question in your first sentence. You installed an aftermarket battery and it's clearly faulty.
Now, Apple may not even be willing to touch your phone since it was opened by someone other than an Apple Authorized Service Provider or Apple directly.
Take it back to whoever replaced the battery.
That aftermarket battery is probably the cause.
phone needs frequent charging despite new battery. Also gets hot.
