Picked up a Lenovo X1 Carbon Gen 1 a few months back and installed a new battery in it along with another 4GB of Ram. It was working well but I let it sit for a while and now that the battery is charged back up it won't run on battery power, only when Plugged in. I tried doing a reset, unplugged the battery and plugged it back in still, it won't run on the battery even though it's fully charged. Any ideas of how to fix it? Thanks.