Battery Activation Board
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Battery activation boards recover cells that have fallen below the voltage at which their protection board allows charging. From that point a normal charger does nothing at all and the phone looks completely dead.
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How to choose Battery Activation Board
Try activation before condemning a battery. A cell left flat for months often looks finished but simply needs lifting back over its charging threshold, after which ordinary charging resumes.
Battery Activation Board frequently asked questions
Why will a completely flat battery not charge?
Because it has dropped below the voltage its protection board permits charging at, so the board refuses. An activation board lifts it back over that threshold and normal charging then works.