Millet tablet 5 charging is very slow, it is recommended to activate the battery while charging in the future, so that the battery charging will have no memory.
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Charge from the AC socket, charge to 100% power off, and then charge until the green light turns on in shutdown mode. Boot into recover mode, select advancsd Advanced mode, and select wipe Battery to remove battery traces. Charge the battery to 100% so that the battery has no memory and it will charge much faster later.