This battery driven circuit replaces a shitty wastefull relay. It consumes around 1000 times less energy than the relay, so it is defently worth building when you are working with batteries.
The signal you apply at the BJT can be up to around 1V low, but make sure, the MOSFETS are fully opened, else they might start a fire.
And dont listen to Hurz with his diode shit. Parallel diodes to the MOSFETs are not necessary, but not harmfull eigher.
