Battery ran low...recharged it but will not power on now

The battery ran down too far. Lithium battery controllers typically lock out if the battery is discharged below 2.6 Volts per cell because trying to recharge at standard current could cause a fire. Even if you can bring the battery back above the lockout voltage using a very low charge current, it may be damaged and will need more frequent recharging.

In other words, your best bet is to replace the battery.

Which model is it? The battery may be rechargeable.

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

The battery is run down too low. When the light came on, alternator stopped working- the vehicle ran off the battery, until the lights and other electricals ran the battery down too low.
Recharge the battery, and have the alternator tested. It will probably need replacing. If you bring it into a parts store, they will test it for free.

Drive it a bit. Computer "miles to empty" is an average based on MPGs. Since you disconnected battery you reset memory so it has nothing to base on.

I had the same problem. Went to the Apple store and the technician said that the IPOD battery ran down to low (battery level showed red) and the USB port on the computer was not strong enough to recharge it. He used a rechargeable adapter that pluged directly into the wall (adapter cost about $30) and recharged it enough for me to take it home and recharge it on my computer.He said to never let the battery level drop below 5% unless you are going to recharge it using the adapter that pluged into the wall. I bought an IPOD rechargeable travel kit from Target for $20 and used it to recharge my IPOD. My IPOD works fine now. The Technician also said at some point the battery will need to be replaced (in a year or two depends). Will cost about $59 to replace it (don't quote me on the timeframe or price of replacement, this may have been just for my IPOD but thought this would be useful info for someone.

What is the voltage you are reading? Is it below 13.2 or so? Also have you checked the current with the engine off to see if something else is working that should not be on. I ran across this twice while working on a truck and car. A relay that was wore out keep trying to close and would drain the battery every couple of months. Sometimes you can hear them clicking or buzzing. Touching them sometimes they are warm or real hot. But that is not a sure sign it is bad. In my Trailblaze they get hot but are ok. Another thougth is the belt on your alt, correctly set to spin it at the right voltage. I have ran across this many times lately with serpatine belts.

can you take out your battery and plug in the power? if it works, i suspected it's a battery faulty. if not please make sure to charge up your battery up to 100% then boot up your machine normally.

did u try connecting it to your computer like i do mine

It's quite possible that you are charging your batteries with a "smart charger." The problem with some smart chargers is that when a battery is drained below a certain voltage, the charger assumes the battery is a lost cause and stops trying to charge it. You may have to get a cheap "dumb" charger to bring the batteries up to a reasonable voltage before turning things back over to the smart charger.