Tablet won't charge - Samsung Galaxy Tab Tablet PC

With your tablet unplugged, press and hold the Power button for around 30 seconds. Then place your tablet on the charger (preferably the home charger) and wait a couple minutes. Then press and hold the power button for around 30 seconds again. If this does not help, then the battery may be bad. Storing a lithium-ion battery should done with no less than 40% battery life left, otherwise the battery voltage or power can go below the safety net (li-ion batteries are not fully dead when your device tells you they are. Once the battery reaches below the safe level, the battery is no longer good or safe to use anymore).