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July 2013) (Learn how and when to remove this message) The liquid contact indicator is the white circular object in the middle of this photograph of MacBook Air logic board . A liquid contact indicator ( LCI ) is a small indicator that turns from white into another color, typically red, after contact with water.
Charging controller of a USB power bank. A charge controller, charge regulator or battery regulator limits the rate at which electric current is added to or drawn from electric batteries to protect against electrical overload, overcharging, and may protect against overvoltage.
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A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.
Try Other Items from Your Pantry. Soak a paper towel in cooking oil or white vinegar and then place it over the sticker for about 5 to 10 minutes to soften the glue.
A known failure mode of Lightning plugs is power contacts turning black over time, sometimes causing the affected side of the connector to cease functioning. When the plug is inserted or unplugged while powered, a brief spark may occur between the mating power contacts in the plug and socket, eroding their gold plating. Because the Lightning ...
Conventional battery chargers use a one-, two-, or three-stage process to recharge the battery, with a switched-mode power supply including more stages in order to fill the battery more rapidly and completely. Common to almost all chargers, including non-switched models, is the middle stage, normally known as "absorption".
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