I decided to go with a lithium battery.

[CID]

I wonder if automatic True battery disconnect did not allow my AUX battery to help the primary battery bc AUX had low voltage too.

It doesn't work that way. Once the cranking battery's voltage drops, the isolator goes open, dropping the aux from the circuit. I don't think the isolator can carry cranking amps.

I don't have dual batteries but I think from what I've read that if the primary battery needs charging the isolator will send all charging to it and not the Aux battery. I'm not sure the Aux battery will help you with starting unless it was wired parallel. You'll have to wait on one these guys with dual batteries to chime in.

You would be correct. 👍

 

[Admin]

 

[Bighat]

I will report with real life soon enough. Antigravity states that you can turn the lights on if need be to start but not guaranteed you will have to. They also state that it will start charging at 32 once the core of the battery is at the temperature from power flowing through it.

I'm not doubting you or the battery company. But what I'd like to know is at what temperatures the battery will warm to 32F to charge. In other words, If it was -15F, how long would you have to operate the charging system before the batteries core was at 32F? I like numbers and you know they'd had to test this and have these spec's.

 

[solrus]

I don't have dual batteries but I think from what I've read that if the primary battery needs charging the isolator will send all charging to it and not the Aux battery. I'm not sure the Aux battery will help you with starting unless it was wired parallel. You'll have to wait on one these guys with dual batteries to chime in.

Yes correct, I think I'd rather go with manual switch and dual lithium