If you research that series you find a raft of issues.
But about this battery. If it's past its 300 cycles or 18 months (the rated lifespan) then the chances it is the battery is high. But given it's a dv6000 model, I'd seriously consider no investment.
The HP calibration / battery check tool won't recognize my battery any more. However, the battery itself is fine.
What could cause this problem?
My laptop is HP Pavilion dv6614tx.