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left my tablet for half year and doesn' turn on

Hi, I broke my acer iconia w3 screen about half year ago and I turnede it off and left it. now when i bought my replacement screen i tryed to turn it on, bu it doesn't work. At first i tried to charge it for 3hrs then tryed different buttoned combination, but it didn't work. then I removed cover, disconnected battery and plugged charged and it turned on. is there meybe some way to fix the battery or i's totally dead? thank you for answer in advanced.

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All batteries exhibit a phenomenon known as self-discharge, i.e. when left unused for long periods they will slowly discharge due to internal leakage currents. Usually this gets worse when the battery gets older.

A Li-Ion cell is considered to be fully discharged when the cell voltage has dropped to 3 Volts. But self-discharge might drop the voltage still further. However, most charging circuits, including those built into Li-Ion powered gadgets, will refuse to charge a battery that has dropped below 3 V, it will consider the battery as being defective.

If the cell has not dropped too far below 3 V, one might attempt to force charge the cell by connecting it to a suitable power supply and carefully monitoring cell voltage and current. Once the cell has recovered to a voltage over 3 V, the charger will usually accept it and charge as usual. However, keep in mind that Li-Ion cells are somewhat fickle and charging a defective cell may result in Bad Things Happening. So if you want to be on the safe side, it would be better to just replace the battery.

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A battery sitting in a discharged state for a long time is probably the worst thing for the health of the battery. Replacing the battery should probably get you going again if you didn't have any other issues.

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You should be able to find a new battery for it if need be. Have a look on eBay or Aliexpress.

Try leaving it on charge (off a wall socket) overnight first though.

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vytautassavickas5 さん、ありがとうございました!
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