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maddog
Senior Member
Last Activity: Yesterday, 4:13 PM
Joined: 25 Feb 2004
Location: Clemson, SC
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  • maddog
    commented on a Visitor Message From baldfatdad
    I doubt I could and I don't think I could make one bigger than what is already built. I think that system already uses lithium batteries so the best I could do is what you already have and to do that you need a battery spot welder which I don't have.
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    Be careful and make sure the balance wires are connected correctly. I would pull the balance plug from the bms before connecting them to the battery and then check them with a multimeter before plugging them back in. Here is a video I found showing what to do. At the 2:51s mark is how you need to...
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  • baldfatdad
    baldfatdad posted a Visitor Message for maddog
    How you been. THis is jack the guy that you got the foot rest from. Can you make/fix batteries for Smart Drive? How about a bigger one?
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    Any of them should work but I would go with one 24v battery. It is the simplest with the least number of bms's causing less issues. Charging the 2 battery system should not be a problem but you know it won't be with the 1 battery. 2 batteries in serial is my least favorite although I can't give a...
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    Bigger is always better, if 10p will fit go for it. If you are starting over and any configuration is on the table you might also think about 7s4p on each side and run them in parallel, have two 24v batteries.
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    3.7v is nominal, the total range is 4.2v full charge to around 2.5v-3.0v empty depending on what the bms is set to. At 8s full charge is 33.6v, too high for me to feel comfortable using. You can buy a 3s bms and continue like you were doing and have a 3s with bms plus a 4s with bms instead of two...
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    I drew your battery in cad but had to draw the wires in paint so it is not the prettiest.

    Drawing of your battery after cutting the back off to make it 7s8p.


    After splitting the battery into a 3s and 4s. Leave all the bms and balance wires connected, move bms along the...
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    Each battery can have its own bms that is not an issue, I was simply saying there was no need to buy anymore bms you could use the 7s bms you already have. The pack you took apart was 7s. The picture above with the cells in the green case looks like 4s8p. That means what you have left over should...
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  • maddog
    replied to ZX-1 Power Add-on owners thread
    Remember you need to stay at 7s total so you need a 4s and a 3s. You can also continue to use the 7s bms you already have....
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