Cars, trucks, RVs, and motorhomes run dual 12-volt batteries for various reasons. Depending on how you wire a two-battery 12-volt system, the result can be a 12-volt system or a 24-volt system ...

General Motors has glued erroneous labels on several GMC Hummer EV and GMC Sierra EV examples, containing incorrect information about the 12-volt battery ... that starts at $24.99 per month ...