My M4500 (got it used on ebay and when I first got it, it had overheating problems but I fixed it by replacing thermal paste) isn't able to boot on battery for some reason. I try to boot my laptop off of the battery (Laptop didn't come with battery so I just bought a compatible battery on ebay) and it doesn't boot after I waited 10:30 Seconds and I wasn't gonna wait any longer because after the 15 second bios boot time it was black screen for the remaining 10:15 seconds and no windows loading or anything. When I plug it into ac without battery (I can do it with battery and ac for same results) and it boots to the windows login screen in 1:43 seconds so, If anyone has any clue why this is happening it would be much appreciated because I haven't found any threads with my issue