Years ago when i owned an eScooter i bought a Firesak… I would take the battery out for the winter and zip it in there. I knew i would have at least a few seconds with that bag to get anyone out. You can look at videos of it on youtube.
Is 60x 18650 cells for 50 bucks a good deal? Kept at 3.9v
(3200 mah)
Definitely not enough info here.
What model of cells?
When were they purchased?
When were they manufactured?
Who were they purchased from?
What were the storage conditions? (Temperature, humidity, length of time in storage)
All of these things are consistent and known variables when buying from any of the trusted sources.
It sounds like you’re trying to buy cells used/secondhand though which, unless you’re pretty knowledgeable about batteries, will leave you almost definitely spending more money for less in return. I’m certainly not knowledgeable enough to be buying from sources other than those trusted here.
Also while this isn’t terribly off from the 3.8v they should be kept at it immediately sets off alarm bells to me that the person selling the cells isn’t following best practices for maintaining them.
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@Egtscs i right here, so many of us have been down this road and it usually leads to wasted money and p42a cells. If you’re looking for cheaper alternatives they are there but the source is as important as the product here. Dont buy the wrong thing and have to rebuy 
What you want to look for are power cells, cells that specialize in higher ampere output and not capacity cells. A little hub board isn’t going to a need a monster cell so you can get away with a lot less so we can try to shoot you in the right direction with a little more info about what you need.
What do you need them for? What is the pack size and output you want? If you aren’t sure yet start with the drive train you plan to use: what wheels, transmission and motors you picked out and we can help ya work out the details. Do you have a budget for this build? Lmk
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It’s part of my mtb build, I just want a bigger battery than my little 12s2p. I understand your cautions, and I will definitely look further into the details, I’m just trying to find ways to cut down on cost.
12s4p, complete batteries go for cheap on here but i can personally vouch for the build of this one. haven is also very meticulous about storage and care of his equipment. You won’t be able to make a pack as cheap unless you get the cells and supplies and tools for free. That pack will easily do 80battery amps continuously and more burst. What’s your budget?
Oh and link your build thread? I thought i had it but im multitasking and lazy
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I’ve seen that, im looking for a battery that will fit top mounted, havens is a great steal tho, budget around 400 for now. (I don’t have a job, I’m a 14 year old scrounging for money 
)
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I also found @alankerr’s battery, a 20s6p, which would work for me because I am using a d100, that’s another option.
Sold choice and also an absolute steal, personally i would shy away from higher voltage for a first build but i am absolutely biased because… i made haven’s battery and it turned out so clean and nice i want to see it rip 
. Just fyi shipping on either of those will probably be in the $20-30 range if you’re in the mainland US via usps.
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Haha, I get it. It’s tough to beat tho, 50 bucks less than havens and more wh…
And it includes ship
$400 is a good budget, if you’re not 100% on board with one of those lipo can probably get you something running for cheaper - but likely be lower capacity at that price point. I think if either of those doesn’t quite fill your needs keep an eye out for other used ones. They really do go for cheap on here
Maybe a wtb thread?
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I am kind of scared wiring up a bms to lipos
Just make sure your motor kv and drive like the high voltage, you don’t want to end up with a compromise that sets your top speed at 80mph or something silly - it can tank your range and torque available if it’s really far off or make your throttle and free spin wonky
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Hmm, good to know
Motors are 6376 160kv trampas, but I will probably switch to Lower kv
Have you messed with the calculator on here much? Put in your ideal setup and options and it will output some specs to consider, it’s not perfect but it gets pretty close
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I have, never fully known how to fill it out
I’ll mess around with it.
It’s easy, if you only put in the battery arrangement and motor kv it will show your max speed - the loaded speed is a bit lower for me as im right around 200lbs. The unloaded speed it to get your erpm needs in the right ballpark. Wh/mile is very rider dependent. i use 8-10 for hubs and 25-40 for 8” pneumatics
Just tweak the settings on it and see what they effect, and remember it is an ideal estimate - real world will show you what it really does.
My first build i was trying for 40 miles of range but my efficiency was way worse than expected… my second was the opposite and now ive got easily 70+ miles of range
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