I have a XS Power D3400 as my starting battery mounted in the engine compartment and an axuiliry D3400 mounted in my trunk. The batteries are wired in parallel with no isolator/relay.

I have an alternator on order from DC Power but I have yet to receive it. My stock alternator is 90 amps. My system draw can be over 100 amps but I have it tuned down for now. I monitor my voltage which stays above 13.3 volts, worse case with engine running.

I am concerned that I will damage my stock alternator and XS Power batteries with my system demands. I am getting more and more ticked that it is taking DC Power over 4 months to get me my alternator and I still do not know when I will have it.

Question is:

Can I connect an XS Power 12v battery charger (over night 8-12hrs) to my starting battery to charge both batteries? I do not want to have to disconnect anything. I want to maintain a good charge on my expensive batteries and keep my stock alternator from being over loaded.

I don't see why you couldn't, it would be doing the same thing as the alternator would.

You are perfectly fine. Its a good practice to maintain your batteries. I check mine often to make sure they are good.

Thanks for the input.

If anybody is charging batteries this way please share your experience.