Apple offers updates quite often, but they don't always address all issues that users are experiencing — namely, being able to use your phone for a longer time before it dies on you. If you recognize the name of the feature, there's a reason: In December, Apple admitted that the feature was responsible for throttling the performance of older iPhones.
They said they did this to prevent aging lithium ion batteries from failing, but this didn't exactly quell users' frustration about having their phones die on them. How do you know if your phone is affected by this throttling, Check the version it's operating. The throttling was introduced in iOS 10.2.1 on iPhone 6, 6S, and SE.
For the iPhone 7, it was introduced in iOS 11.2. If you have these phones and models, your battery life is probably being affected. This is part of what the new update addresses. Once you download it, you'll be able to enable or disable the battery management feature, which allows your iPhone to operate at its peak performance until that battery is done. Basically, you'll be able to use the battery fully until it just flat-out dies instead of keeping the feature on to preserve its lifespan (but reduce its day-to-day performance).
These battery issues haven't really been affecting Apple's most recent iPhones, like the iPhone 8, 8 Plus, and the X, so if you have one of those, you probably won't need to worry. The update will also allow iPhone users to check their battery's health to see if it needs to be replaced.
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