This is a very interesting topic!
I was having problems with my 120 starting up, so replaced the drivers side
battery (RHD) with a Varta, it never really turned well after that but at least i didnt need to jump start it! after about 3 months the jump starting started again! Just replaced the alternator and checked charging was all spot on.
I checked the drain when stationary and after the ECU booted the current steadied off at 40mA as expected, this then got me thinking that i should have changed both
batteries at the same time (pretty sure you would all reccomend this as good practice!), so after alot of deliberation about was i running a 12v starter or 24v starter i worked out it was a 12v system, i then removed the drivers side
battery and it booted over fine, then put back the 'New'
battery in the drivers side and removed the passenger side
battery, solenoid engaged but didnt even try to turn it!
Battery had a 4 year warranty so i decided to buy an identical one from elesewhere, fitted it and ran the same tests again, booted perfectly with either
battery and with both it felt like i could run it up and down the street just on the batteries!
The -ve lead on the UK drivers side attaches to the engine block, the LHS -ve is to the chassis and somewhere else, the +ve are joined together so no problem there!
My research told me that the 24v starter systems seem to be more prevelant in the colder countries but nothing concrete?
So my answer is yes unless anyone can shed any further light on this?
Simon