HP 3468 voltmeter with HP-IL

[4ster]

Anyone here had experience with the HP's IL voltmeter?

I'm looking at buying a 3468 voltmeter. Since it would be used mostly away from a bench it will have to be battery powered, and that was an option offered by HP. I've only seen one offered with a new main battery. I've also noted that there are A and B models.

If I were to buy one, can all models be upgraded to the battery option? I'm looking at a 3468B right now that is not offered as a battery powered unit. It has been serviced and calibrated with a new lithium backup battery to retain calibration.

HP's battery option sounds like it was a sealed lead acid gel cell. Was it a standard size or will I have to get creative if I get one without a battery?