Depending on how you wire a two-battery 12-volt system, the result can be a 12-volt system or a 24-volt system—or even both 12 volts and 24 volts. Race car ballast:Two trunk-mounted batteries ...

It probably won’t be long before the bulk of lawn mowers and even snow blowers rely on batteries in place of gas engines. And while lithium-ion batteries are an impressive feat of engineering ...