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  1. D

    13s4p/48V/21700 DIY Questions - Samsung 50E okay for 750W BBS02? [Edit: Why is nothing in stock?]

    That's a suspiciously good price. Are those verified to be authentic cells?
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    new battery case idea no welding/soldering

    I've tried both of these systems. Vruzend is great for stationary applications , but not good for high vibration, like bikes etc . The caps shatter after a year or so and lose integrity. The NESE modules are a whole 'nother ballgame. They're much more robust and can handle road and light off...
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    Buying a new battery: your advice sought

    One thing to add ; a thin sheet of PVC , wood , clipboard backing, whatever, to the broadside of the assembled modules and duct tape or shrink wrap it, it really makes it durable and essentially vibration proof if you're a more active biker. I don't wrap mine though as I mostly stay on the pavement.
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    Buying a new battery: your advice sought

    Yep they're great. The real beauty of the NESE modules is if you need higher amps, just pop in 40T and you're set.
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    Buying a new battery: your advice sought

    It's 14s5p stacked flat and laying on it's side , like a loaf of bread if you will. That's "25AH" @ 58.8V if you charge to 4.2V per cell. I don't . I charge to 57.4V (4.1V per cell. I haven't measured actual capacity , but it's close to that number after 15 months of every day use . For low...
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    Buying a new battery: your advice sought

    18650batterystore(retail side)/Bulkbattery.com(wholesale side) is a good vendor in my experience. I've only had 3 orders with them, but they ship fast and their products and support are spot on. They're my go-to . 50E2 using NESE modules has been the best combination I've used . No worry about...
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    What cells to choose?

    If you end up going the cylindrical shape route , and spot wielding isn't an option, I would recommend the NESE modules. I've been using them on a daily commuter for about a year now and they've been trouble free. Individual cell dimensions matter , though, so be sure to let him know if you're...
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    Li-ion cells cycle ageing

    Yeh the dimension variances are not cool. It sucks to design an enclosure only to find that some cells of a particular model will fit while others won't.
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    Li-ion cells cycle ageing

    Nice , thank you sir :)
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    Li-ion cells cycle ageing

    Yeh definitely, since prices and availability of Samsung & LG cells are becoming more painful every day it seems. A good low cost competitor is sorely needed. I lucked out and grabbed 100 50e while they were still under $5 , but they're now over $7 pretty much anywhere in the states.
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    50E and NESE

    Just to update those that are interested, I got the 14s NESE build on my wife's Radrunner and it's awesome how well it fits under the seat on that bike . If you are using 50E with those modules , make sure you tell Agnius (@ AMTech) up front that you are using that cell so he can upscale the...
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    safe fusing /circuit breaker

    I just had the breaker from another project and thought of using it , if it is sufficient to avoid a fire in the event of a wipeout type scenario. I'm hesitant to fool with bms units due to "another electronic gadget to fail" , but I do see the value in them and may just do that anyway.
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    safe fusing /circuit breaker

    In case of a dead short, is a 60 amp fuse good enough to prevent a fire ?
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    safe fusing /circuit breaker

    My wife has a RadRunner which has 14 ga leads for the battery side . I replaced the stock battery and hugo connector with a 14s that I made w/ 12ga and 30A Anderson PPs . I was curious if a 60A 72V breaker would be good enough or should I stick with an inline fuse of lesser rating like 30A or...
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    50E and NESE

    Has anyone had experience with the 21700 NESE modules fitted with Samsung 50E ? I don't have a dial caliper to measure mine, but I suspect they're just slightly too long to fit without damaging the module and cover. I suppose it's possible that my cells are fakes, but the wrapper and positive...
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    N.E.S.E. the no solder module

    Has anyone had experience with the 21700 NESE modules fitted with Samsung 50E ? I don't have a dial caliper to measure mine, but I suspect they're just slightly too long to fit without damaging the module and cover. I suppose it's possible that my cells are fakes, but the wrapper and positive...
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    is there a prob in this battery diy plan with prebuid case?

    Will those pop in the case of an external short?
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    Amount of cells? many or few

    Ah ok. Thanks for clarifying that and being nice about it .
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    Amount of cells? many or few

    Also , while the more cells you have in parallel ,the less total resistance there will be, mixing high impedance and low impedance is a bad idea , from my limited understanding. You wouldn't want VTC5a mixed with PF in other words.
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    meanwell issue

    Ah, ok , I never considered that they didn't design these in mind to power an already powered device. Makes sense. Thank you sir.
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    meanwell issue

    It doesn't get power at the output leads unless I plug it in before adding a load. I tested it by removing the battery . It will be 0 v until I unplug it for a minute . Like it resets a tripped breaker/failsafe , whatever the mechanism is. As long as I let the caps charge first , I can plug in...
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    meanwell issue

    I have a Meanwell HLG 480-54a that will only " turn on" if I apply input voltage first and then apply the load. If I hook it up to the battery first and then plug it in, it doesn't charge . Is this a function of current fault protection or is there some type of disfunction going on?
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    Battery switches off at full throttle

    No I meant my guestimate was stupidly inaccurate. I was brainfarting off the hip when I said it probably had 80% left. It likely is closer to 90% , but the drop in capacity after the first year , 100ish cycles , was very noticeable. I haven't discharged it completely to test the capacity...
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    Battery switches off at full throttle

    80% is stupidly inaccurate. It's very noticeable though.
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    Battery switches off at full throttle

    My wife has a Radrunner with a similar battery except it's only 13s5p and she has a lead foot...err lead thumb to be more exact . The controller on that contraption peaks at like 18amps I believe and after a year, the capacity has shown a noticeable drop. It still has probably 80% of its new...
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