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I need a 36V battery for a project of mine. Eventually I will buy a li-ion pack but now when prototyping and testing I don't want to spend a lot of money so I'm looking at cheap alternatives.

I'm considering making a 36V battery from 3 12V lead acid batteries. I found 9Ah ones that would cost me about $30 total but I don't also want to spend that much on a charger. I have a car battery charger for batteries up to 65Ah (6A max). I'm thinking if I put my 9Ah batteries in parallel that would draw around 3A I suppose which should be fine for the charger but I'm afraid if it's going to be able to maintain the proper CVCC modes because it wouldn't know it's charging 3 batteries and it most certainly wasn't designed for this.

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  • \$\begingroup\$ Should not be a problem to put them in parallel, unless their initial voltage difference is too large, and charge them that way, but you are aware that you will need to break the series connection before you can parallel them for charging? \$\endgroup\$ – winny Jun 8 '20 at 9:37
  • \$\begingroup\$ @winny yes yes, that's kind of inconvenient but for this ridiculously low price I don't mind. \$\endgroup\$ – php_nub_qq Jun 8 '20 at 9:38
  • \$\begingroup\$ Then no problem. Just make sure the voltage difference isn't too large before connecting them in parallel. \$\endgroup\$ – winny Jun 8 '20 at 9:39

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