old qosmio x300 question - battery

I used a QosmioX300 from about 2008-2010 before I got an Asus G73. It had some problems when it came to booting up, but did fine as long as it wasn't turned off. What happened was a problem I thought was best described as the surplus charge problem, where if you left it plugged in while off it would think it had 0 charge and refused to startup. You had to remove the battery and let it discharge and then it would turn on.

Since I got my Asus about 6 months ago, I had the Qosmio as a backup but never needed it. I might try to sell it but I want it to be working and I want to make sure this problem isn't serious and it can be avoided 100% of the time. But I started it up last night and now it does long beeps if it boots with the battery in at all. It also shows a single line of white text which shuffles through registry keys at the time it should show a Qosmio logo on boot-up. It is a single long beep, which repeats with pauses of maybe 5 seconds.

It only happens when the battery is in. It works fine if I have no battery and plug it in to AC.

Is it just a bad battery, or something else? This is a laptop that almost always had a boot problem if you turned it off.

Oh and it is a QosmioX300, which I think is just X305 with a Canadian keyboard.

When it fails to boot because of being plugged in with a full battery, it will turn on and make the normal hardware sounds (fan getting started and hard drive clicking) for about 5 seconds. Screen stays black and then the whole laptop dies with a loud click.