I think there is more to it then that. It has some smarts with regard to the battery voltage it expects. Here is a quote from some of the documentation I've read on the converter:palerider wrote:
well, like I said, the converter says it's good for 12 to 24 volts dc input. like most boost converters, it's not that picky about what it eats
"The converter will shutdown automatically when the voltage drops below 10.5 volts for a 12 volt battery, or 21 volts for a 24 volt battery. This will protect the battery from damage due to being allowed to fully discharge."
So that begs the question, what happens between a maximum 12V lead acid battery charge of say 14.8V and the minimum 24V lead acid battery charge of 21V? The 4S LiPo's sit at 16.8V with a full charge.