How does frequent charging of phone affect the performance of the device?
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You can charge a modern phone any time you like — even while using it — and it won’t be a problem. Though if you’re using it while it’s on the power adapter, it might not actually be charging much, if at all. That power will be used to run the phone, and only if there’s enough left-over power will the battery get any charge. Li-ion batteries age based on full charge and discharge cycles, and a bit faster if they get too hot. So whether you charge for an hour or two once a day, or a few minutes a day at many different times, the result is the same.
Almost. There is an aging mechanism that kicks in at about an 80% charge. So it’s not a terribly good idea to keep your battery near a full charge all the time. I’m can’t exactly put that into numbers, I just know that it won’t last quite as long if you keep it near full charge all the time. However, your phone’s charging system will turn off once the battery is full. You can’t overcharge it.
The basic function of a battery is to charge and discharge, so eventually, it is going to die. But frequent charging of smartphones should not bother you because if you are using original chargers or compatible chargers, they will safely charge your battery. Yes, it is true that every battery has a limited charging lifecycle, but it is also true that if you use original chargers or compatible devices like travel chargers, portable chargers, multiport USB chargers, and wall chargers, they minimize the risk of damaging the battery and optimize the charging process.
If you are in the habit of charging your cell phone for longer periods of time, then overcharging your device may be a problem, but modern smartphones are smart enough to take care of this issue. They know the status of the battery—once it is fully charged, smartphones stop charging, even though the charger is supplying the power.