Just checked, it is a 11.1V battery, which means it is a triple stacked Li-ion (3.7V x 3). So the low end should be (3.2V x 3) = 9.6V. As long as it is around or above that number, the battery might be fine. But if it is well below that number, then it is likely a goner and required a replacement. Before measurement, do give it a recharge for a few hours so you will know for sure it is the battery not taking any charge.
There should be 4 wires coming out of the battery, 2 black and 2 red, connected to PCB with a socket. Just measured the outer two pins (one red and one black) and it should give you a reading.