Hi everyone, I know this is probably a dumb question but I'm a n00b.
What would be more efficient and last longer: using a 9-volt battery and using a step up regulator to step it up to 12 volts; or have two 9-volts wired in series to produce 18 volts and then use a step down regulator to lower it to 12 volts.
What would be more efficient and last longer: using a 9-volt battery and using a step up regulator to step it up to 12 volts; or have two 9-volts wired in series to produce 18 volts and then use a step down regulator to lower it to 12 volts.