So my car has been dieing after sitting overnight. It won't start in the morning. I have been leaving it on the charger overnight.

I have an Optima Red Top under the hood and a 55ah SR12-205FR Super Rate Series in the trunk.

I took the trunk batt out at Autozone and the guy tried to test it and said it was at 10.xx volts and he couldn't run the test with it that low. He said that I have to do a trickle charge on this batt, it can't be charged with a regular charge. Is this true?

Then we tested the red top (with the trunk batt still disconected) and it was resting at 12.41 volts and read as a bad batt. The Autozone guy said it should be around 12.45 volts and I should trickle charge it as well before replacing it. Will .04 volts seriously make a batt read bad? I don't think so. Should I just replace the red top and see if it fixes it?

What do yall think?

Any info provided is much appreciated. Thanks.

sounds like you need an isolator or identical batteries.

u shouldnt mix an optima with any other battery for one.

2nd, you shouldnt mix battery brands either.

If u wanna do that, get a solenoid to prolong their life.