Another way to bring your battery to life is the following trick which applies to many deep-unloaded tablets/phones.
Keep the power button pressed with a piece of tape and something hard under it. Now put it on the charger for an hour. This will bypass the circuit and charge the battery. Don’t keep it too long because it may damage the battery.
Now unplug the charger and remove the tape. The tablet powers on as normally, and you can charge as normally now.
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