Charging starting battery

I have a TRIK-L-START and it works fine...as long as you're plugged into shore power (like snowbirdng, for instance). Simply put, it "cannibalizes" the power from the 2 6V batteries into the 12V starter battery so it never runs down....and you can always start the motor, and in addition all the stuff powered by the 12V starter battery keeps going.

However....MY experience with the gadget is that if you leave everything intact when NOT being on shore power, (storage, for instance) ALL the batteries drop after a month or two. No coach power...no engine start power. Then the jumper cables come into play.