OK, so military. But why use an obscure battery size? 12V is the standard worldwide pretty much, including the heaviest of vehicles.
So we're in town and a battery goes down....we now have to dump the dead battery and two more good (2 X 4Volt) batteries and wire and secure a single (highly available) 12V battery in the place of the duff battery and the other two we've had to remove....just don't make sense, military or otherwise.
|