The 300 - volt battery pack provides electric power for the system, and is designed to fit in the vehicle without compromising passenger space. (media.fcanorthamerica.com)
There are two auxiliary 12 volt batteries in parallel located on the left exterior side in as storage tray. (autoclassics.com)
For example, 2, 3, or 4 nine volt batteries hooked together in series, solar panels, automobile batteries, and most wall chargers work. (elixa.com)