Does this sound like a dead battery?

[SVOboy]

You've prolly seen the end of my project thread, but here's the basic problem as I've become able to see it. Anyway, started up it was obviously almost dead, got going and the light faded on, gained up some rpms, faded off, and so on and so forth, but every time I went low on rpms it would come on just a little bit, I guess because it wasn't charging so well. So dead battery, yeah? I need to go find a battery for my DMM now, but what should I be looking for in terms of readings?