Apple confirm that iPhones with older batteries are slowed down intentionally to avoid sudden shutdowns etc.

manojrk

Newbie
Regulars
Nov 14, 2012
599
187
Chennai
I got my dad's 6s battery replaced for free! Initially they told me to pay Rs. 2000 but later they informed that it was eligible for free replacement and Apple has been doing this for select 6s models. The replacement offer ends by Dec 2018 so if anyone else with iphone 6s looking to swap your old battery, just verify with Apple customer care if your device is eligible and get it replaced!
 

IBF

Insane Member
Sep 21, 2016
118,302
25
iPhone Battery and Performance - Apple Support

Additionally, users can see if the performance management feature that dynamically manages maximum performance to prevent unexpected shutdowns is on and can choose to turn it off ... This feature applies to iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, and iPhone 7 Plus. Starting with iOS 12.1, iPhone 8, iPhone 8 Plus, and iPhone X include this feature, but performance management may be less noticeable due to their more advanced hardware and software design.