Compaq Presario V2000 Is the CMOS batt rechargable? (Batt ML1220)

Hi
I have a Compaq Presario V2000. It will not boot up or show any signs of being powered. I think the CMOS battery needs replaced. The battery is a Panasonic ML1220. What I want to know is whether the CMOS battery is rechargable. I've found a battery locally, but it cautions not to recharge this particulary battery. It's a UL1220. Any help would be appreciated
Thanks in advance,
Ron

This does seem to coincide with a hard drive issue.
I don't have access to a system like this, but go back into BIOS.  Is there an option for SATA settings anywhere for IDE or AHCI?  If so, try setting it to the opposite of what it currently is.  For example, IDE to AHCI or AHCI to IDE.
Another thing to check, and this is easy to miss, is anything at all connected other than the charger?  If so, disconnect all non-essential devices.
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