Battery Level of a RAM card backup cell, SRAM HP 95LX

[cfh]

Dear Forum,
I am in the process of "recommissioning" my HP 95LX. Both work and leisure. Most data concerning total cost of ownership and depreciation of automobiles.

Have all programs I need, and CF adapter for the SANDISK/SUNDISK 32 MB: many more bytes than I will ever need. Love the keyboard and the HP Solve Calculator. The display is also nice.

BUT, for my 128 kB, yes, kilo bytes , HP Original RAM card, or SRAM, with a coin cell battery backup, I am courious on how to measure the battery level. The 95LX has the voltage for the main batteries and the "mainframe" battery backup.

How can I acces the SRAM card backup battery level, preferrably via DOS?

kind regards
CFH

(also, nomenclature for the 95, is it an HP 95 LX, or HP95LX, or HP-95LX, or something else?)
(Battery Low issue solved, broken hinge not solved and file transfer with Linux through USB port solved with gkermit)