• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

automotive EFTPOS battery charger


New Member
this is a eftpos charger from a vehicle. but looking at the input dc to the charger there is two seperate negatives... to the left you can see the red wire to charge sla battery , but the negative doesnt connect up to anything , just goes to the green power connector, can i just join both negatives together ?. i want to use it to power a low voltage led light instead of a eftpos unit..


Les Jones

Well-Known Member
Most Helpful Member
I suspect it is done like that so that when the DC power connector the the charger board is not plugged in there is no leakage back in the the charger board to discharge the battery. I have never heard of eftpos chargers so I know nothing about them. By "it" do you mean the power supply that feeds the charger or the SLA battery ?


Latest threads

EE World Online Articles