power monitor cable

I decided to upgrade my 500mm quad-frame to ardupilot APM2.5+GPS

Unfortunately I don't have the power monitor cable and was wondering for some help on this? I'll build one if need be...

I'm an robotics engineer and has no problem understanding ccts, firmware and software

my question is -

The power cable monitors the lipo cell voltages (I assume) and when reaching a thresshold gives a boolean logic signal to the APM

My questions are then does it monitors voltage or current?

What type of signal does it gives to the APM?

Theo

 

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