I think these are not bad for new batteries.

BoloMKXXVIII

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$500 for a 100Ah 12v battery, plus tax, plus shipping, without a BMS, case, wiring or warranty. I don't think it is a horrible price but when you are done it won't be much cheaper than some of the commercial batteries. If you WANT to build it yourself, by all means do so. Let us know how it goes. I am not familiar with these particular cells and would love to hear how they perform.
 
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