[paule67]

I am looking into building a high mileage EV and I need to ask some questions. I used to work at Sears in the battery dept, so I have some experience with them, but very little in multiple setups.

1. In an EV with a 144V system, 12-12V batteries in a system in series, if all batteries are fully charged to 12.8V, and one is a higher AH capacity(11 batteries are 20Ah rated @100, and 1 is 20Ah rated at 150) Will the higher capacity be drawn off first? Or do all the batteries give off energy relatively equally? What about when you go to recharge? Will it recover correctly when you put a 144V charger on the system? How do you check?

I am assuming you have to check voltage with respect to specific gravity to verify, is this right or is there another way?

2.In an EV with a 144V system, could you run 10-12V batteries and 4-6V batteries if they were connected in series?

Thanks for your replies.