okay so guys...here is the battery that i intend to use:
its a volta 90ampere maintenance free battery.
i need expert advice on connecting the with the main battery. can someone who has installed a secondary battery share some info in this regard?
i know i can easily connect both batteries in parallel (positive to positive and negative to car body ground). that would add up the amperage of both batteries and keep the voltage across both of them at 12volts (14.4 volts with engine running). but i dont want to connect it like this.
i need help in putting a relay/actuator that would charge the secondary battery when engine is running, and would be cut off from the main battery when engine is off. i dont want to risk draining my main battery because it might give car starting problem.
so any ideas?? i know enerlevel installed a secondary battery and there was another guy who also did that, though forgot his name.