Using 5V USB Power Instead of 3.7V Battery on Chinese Allwinner Tablet Safe?

i know this is going to be a dumb question but here it is.
if i had to solder a usb lead to the positive and negative sections of where a battery should be on my tablet would i be able to just use it with a 5v usb plug instead of a 3.7v lithium battery?only reason i ask is because i have a Chinese all winner tablet and the battery only last for around 1h after an 8h charge and to get so little  time on it i would like to know if that would work so i get more time on it

[User comment deleted]

James....absolutely support Mike above.  DO NOT take USB 5V direct to your battery connections (even if you remove the battery).  You might get away with it (as there will probably be a regulator between the battery and the tablet circuitry) but if you don't, your tablet will be toast.  And if you left your battery in, it would overcharge and likely explode or catch fire.
Battery replacement is the only good way to go....it might not be easy but as Mike says get the right type.  if the existing battery does not have the type marked (liPo, LiIon etc) see if the manual or the internet tells you anything.As Mike says, you'll need a bit of good luck for this, but worth a try.

Thank You for your response I only know a little about electronics as I have never been to college or university, I just get ideas and go to pursue them but as it was something to do with a tablet I use to play games on when I am not on a laptop or messing around with my soldering iron I thought It would be best for me to seek advice before proceeding with this idea.Thank you again for responding really appreciated

Thank You for your response really appreciated I think I will stick to either getting a new tablet or a new battery which ever sounds better

You also need to look carefully and the current capacity. That will determine how fast the battery can be charged or discharged. Li batteries of any sort have very specific charging requirements and need to have protection circuitry to prevent over charge, excess discharge, over voltage, and over temperature. Without that circuitry, and without knowing the maximum charge current of the charging circuitry in the tablet, you risk explosion and fire. Lithium batteries are not something to causally mess with.I would suggest that you look for an "external battery pack designed for a tablet." These will look about like a small external hard disk. You leave your tablet sealed up and unmodified, and plug the tablet into the external battery back just like you would a wall charger and use your tablet just like you would if it were plugged into the wall.  For a tablet, you'll probably want a rather large one; on the order of 10,000mAh or so.
Unless you know a lot more about the specs of the battery and the charging circuit, the external battery is the only safe way to go.Duane