If i need to modify the circuit for a 6V battery, I just need to play around with R8, the trimpot and R6 right? Could anyone suggest some values please?
Also, I need to protect my battery, so I thought I should connect a relay instead of using an LED. but the problem is the LED turns on when voltage is low... meaning it'd turn on a relay when voltage was low. Quite the opposite, i need to turn it off. i though of scaling down the output to 5V (Voltage divider?), feeding it to an inverter IC (7404), feeding it to a ULN (darlington pair IC to boost current) and then feeding it to a relay (so the relay is off when the voltage is above minimum)... LOL there is probably a simpler way to do this!