Charging your phone/laptop.


        
            
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            A Simple Guide To Battery Health
Why phone batteries wear out
Modern phones use lithium‑ion batteries, which slowly lose capacity as they age.  Two things speed this up: keeping the battery full at 100% for long periods and letting it regularly drop very low before charging.  Over time, this chemical wear means your phone will not last as long between charges, even though it still works.
Is it safe to leave a phone on charge?
Modern phones are designed not to “overcharge.”  When the battery reaches 100%, internal electronics stop the main charging and only top it up in small bursts if the level drops a little.  This makes it generally safe to leave a phone plugged in overnight, as long as you use a decent charger and avoid covering the phone so it does not overheat.
Why 100% all day is not ideal
Although being plugged in is usually safe, keeping the battery at 100% all the time holds it at a high voltage, which gently speeds up aging.  Think of it like stretching an elastic band to its limit and leaving it there; it will weaken faster than if you only stretch it part way.  Tests and expert opinions suggest that always charging to 100% can make the battery wear out noticeably faster than stopping a bit lower, such as 80–90%.
How an 80% limit helps
Many phones now offer a setting that stops charging around 80% (or delay full charging until just before you usually wake up).  By avoiding the final, most stressful part of the charge, this keeps the battery in a more comfortable range and can extend its useful life by months or even years if you keep the phone for a long time.  In everyday terms, you trade some maximum battery runtime for slower long‑term wear.
What makes sense for most people
If you are at home a lot and can easily keep the phone plugged in, using an 80% (or similar) charge limit is a very good option for preserving the battery.  You can leave it connected most of the time, knowing it is not being held at 100% constantly, and only turn the limit off when you know you will need a full charge for a long day out.  For people who rely on every last bit of battery each day, charging closer to 100% is still fine, but accepting a little faster battery aging is part of that choice.