Battery ran down and can't get on internet

The fact the battery shows fully charged means nothing, the symptom is a defective battery.

sounds like the battery is faulty, speak to the supplier you got it from it needs a replacment battery check your warranty

The battery is dead and cannot be recharged. Replace the battery.

See if you can remove the battery out for 1 minute. Put it back and try to turn on your phone. See if it will boot.

If that does not work, please remove the battery out and put it back in right away. Then press and HOLD Volume Down and Power buttons at the same time for 10 seconds. See if it will turn on and work normally or you will see the Recovery Menu.

I suggest a hard reset.

• Ensure that the Samsung tablet is powered off.
• Press the Power and the Volume Up button together till the device displays the start-up logo.
• Once the logo is displayed, release the buttons and wait till the device enters the Android system recovery mode.
• On the displayed screen, use Volume Down button to go to the wipe data/factory resetoption (Volume Up and Volume Down buttons are used to highlight the displayed options on the Android system recovery screen).
• Once the option is highlighted, press the Power button to select the option. (Pressing thePower button in Android system recovery mode selects the highlighted option.)
• On the next screen, press the Volume Down button multiple times till the Yes -- delete all user data option is highlighted.
• Press the Power button to hard reset the Samsung tablet device while clearing the dalvik cache along with the process.

best learn the principles of your tablet first
first when a battery is less than 10% it takes up to 5 hours to recharge not 5 minutes
next many tablets do not recharge when in operation so you have to shut down to allow the recharge to work
because the battery was dead flat , of course it will reset as that is the same as removing or installing a new battery

check for power from your charger or the connection going into your unit did the battery read fully charged could be a battery issue