Battery not charging tablet gets hot and wont turn on

Time to change the battery

That symbol usually indicates the battery isn't charged or charging. It could be a connection problem, a charger problem, or a battery problem.

If you have an extra wall charger, try that first as they don't always last forever. Make sure the plug that connects to your tablet looks clean and not corroded.

If it still won't charge, then chances are the battery needs servicing to make sure the connection is OK or the battery just might need to be replaced.

Either the charger or the battery is faulty, from the sound of your fault description. If the tablet will turn on and run normally when the charger is plugged in, then the problem most likely lies with the battery. If it will not run even when the charger is on, then the charger is most likely the cause of the fault. If your tablet is still under warranty, either problem should be repaired free

Check its charger. If the charger is faulty, it won't charge the battery. If it is found OK, replace the battery. It is bad.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

At this level of charge their is not enough to start the boot process , if it doesn't charge at all their may be a fault with the Battery cell , however i had a similar issue, just leave it for a while, if their is still no indication that its charging or it wont turn on their could also be a problem with the Start Button

If it won't charge then you may have a defective charger, a failed battery or a loose solder joint at the charging port. If your charger plug is fitted with a fuse then consider checking the fuse is okay by trying a new one. Also, check your charger on a friends HTC, check their charger on your HTC. It really is a process of elimination to find the issue yourself.
The HTC won't turn on because it isn't charged, until you fix charging prob it won't turn on.

Sorry to hear/read this.
First, try get a new charger and plug your Google nexus 7. Suspect a dead battery with no charge left on it.

Otherwise, confirm your charger isn't just lighting up whereas it isn't delivering any charge current to your device.

Next to try if your ac charger is confirmed good is to attempt replacing the battery; at the store, have them insert a compatible/similar battery and then try power on your device.

NOTE:
New batteries at the point of purchase have some charge on them; sufficient to power on your device.

Device not power on, DON'T PURCHASE NEW BATTERY. Obviously, you don't have a power/battery problem.

Device power on, then you either have a battery that has failed or that your device's charging port needs to be serviced or repaired.

Please post update/feedback asap. Thanks

Try removing the battery and see if it will boot without it
Then check the caharger, charging light should be green and steady on the charger itself
If it is flickering, it meand power is not making a circuit, test charger jack with a DC volt multimeter with one probe to the outer side (earth) and one on the inner (positive). If this is ok, check the charging socket is not loose (if it is, will need replacing).

After that, suspect the power strip or charging / powerboard is dead on the motherboard