Patches and discussion for Ensoniq VFX family

I received this info from a repairship a few years back (I think 
around '96) concerning the battery in the SD-1 (and I am certainly 
NOT an electronics repairperson of ANY kind, so I'll have to 
paraphrase): The only one to replace the battery (which is the 
yellow capacitor sized component described in a previous posting, 
and which should last at least 5 years according to the Users 
manual), should be an authorized Ensoniq (now Emu?) repairperson; 
or, as a minimum, an experienced synth repairperson. The reason: I 
was told the proper method to replace the battery first involves 
something like wiring the replacement battery (or some source 
equivalent to the battery load) in parallel PRIOR to removing the 
old one. The apparent reason: removal of the battery does much more 
than wipe out your RAM; it has been known to wipe out the ROM0 and 
ROM1 also, which I guess means replacement of ICs on the board. Has 
anyone heard of this battery replacement method, or anything 
resembling this type of process?