Changing a PAC battery

Ok, do you know if this battery charges itself when plugged in in the MSX? Of is it a standard not rechardgeable battery?

I made a little tool some time ago, maybe you can try it: SRAM Manager

SRAMM : PAC SRAM Manager 1.0 - March 2013, coded by Louthrax
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Usage:
sramm l
    List the contents of all SRAM cartridges detected on your MSX.
sramm c (source) (target)
    Copy one or all pages from an SRAM cartridge to another one or to a file.
sramm z (sram_target)
    Zero (erase) one or all SRAM pages.
sramm
    Display this help.

(...) parameters can be a file name ("xak.pac") or an SRAM page
with the following format: #(page_number)[cartridge_number]
    (page_number):
        "1" to "8" means an SRAM page.
        "a" means all the pages on the cartridge.
    [cartridge_number] is an optional parameter to target a specific
        SRAM cartridge if you have several ones. If omitted, first
		cartridge is used.

Examples:
sramm c #a all.pac
    Copy the whole content of default SRAM cartridge to file "all.pac".
sramm c #11 xak.pac
    Copy page 1 of SRAM cardtridge #1 to file "xak.pac".
sramm c xak.pac #11
    Copy file "xak.pac" to page 1 of SRAM cardtridge #1.
sramm c #1 #2
    Copy default SRAM cartridge page 1 to page 2.
sramm c #a1 #a2
    Copy the whole content of SRAM cartridge #1 to SRAM cardtridge #2.
sramm z #a2
    Erases the whole content of SRAM cartridge #2.

Limitations:
    - This utility only works with Panasoft PAC compatible cartridges.
    - Due to the command syntax, you can't create or read filenames beginning
      with the "#" character.