Battery problems in iOS 11.3 with respect to phones that are two or more years old seem not necessarily to be linked to the poor condition of the battery or its wear, but also to the consumption required by the latest version of the operating system, clearly adapted to terminals more modern. The point is that Apple is still quite conscientious in informing users about the quality of their battery.
This latest official version of the system, iOS 11.3, includes new alert messages that warn the user of the health of their battery. These types of messages help the user to know whether or not it is a good time to qualify for the battery replacement program.
These messages have been discovered by the team of cultofmacHowever, we have not yet been able to verify the content of the messages in Spanish adapted to the operating system. This is how they are reflected:
This iPhone has experienced an unexpected blackout because the battery is not capable of delivering the necessary peak power. Performance management tweaks have been made to prevent this from happening again.
Apple has wanted to go from keeping the issue of limited performance in terminals with worse battery (or with more draining batteries) totally secret to even offering alert messages. Nevertheless, These messages do not include information regarding the battery replacement program that Apple has made available to its users, As you well know, for "only" 29 euros you can go to an Apple Store to request that the battery be replaced, in this way in older terminals such as an iPhone 6 or an iPhone SE you will notice an improvement in performance, since the Power limitation will not be able to come into action, theoretically, beyond the limitations of the hardware.