Latitude C610 Downgrade BIOS

I recently upgraded my Dell Latitude C610 to the latest BIOS (A16)

Now the battery will not charge over 53% where before upgrading it would fully charge.

I want to downgrade to BIOS A09 but when I try to use the hard drive install method (I do NOT have a floppy drive in this laptop) I'm told a higher version is installed and the installation is halted.

I do have a DOS boot CD so I can get to a command line but Dell don't seem to supply a regular BIOS flash tool or a plain .bin BIOS file.

Does anyone know where I can obtain a A09 bin file for Latitude C610 laptop and a DOS BIOS flashing application?

 

Does the battery last the same amount of time as it did with the old BIOS? Maybe the old BIOS was only charging to 50% but showing it as full and the new BIOS is giving you a more accurate reading.