How to Replace Your iPhone 6 Battery - iFixit Repair Guide
Replacement for iPhone 6S Battery Connector Port Onboard
Apple iPhone 6 Plus - Battery Connector Port Onboard | Fixshop
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
iPhone 6s Plus teardown reveals a 165 mAh battery downgrade versus last year's iPhone 6 Plus
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Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?