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    Have you ever come across dangerous ebike batteries with faulty bms's or extra functions that causes the error?

    Have you ever come across dangerous ebike batteries with faulty bms's or extra functions that causes the error? and did you solve it? Like if the problem was with the cells, the bms or extra functional items like a usb unit, light unit or battery level indicator unit being the culprit of the...
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    My own battery store and battery repair shop: ( Goodboybattery

    So time to start planing to open one, he? My own battery store and battery repair shop: ( Goodboybattery Yeah, I have some idéas so that will make it happen and some people with very high and capable skills I can do some co-operation with Wish me luck. So first out is a place to build the...
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    What is a normal level of battery protection an safety items?

    So I´ve recently opened up a few batteries from a battery manufacturer and they have not installed any fuse on the output. Also there is no fuse on the charge port apart from that it is connected with a BMS that has separate charge and discharge port. This bms is called daly with an aluminium...
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    Controllers in general. Many on the market but which one gives the most reliability? Which one should I get?

    The question is wide. Let's say I have been using a few controller at around 2kw - 14kw depening on what measurment you use to decide controller power. My history of controllers: Sabvoton 72150 + 50a extra flux is is the most powerful I have used I think. This controller has some kind of...
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    Which are the worst cells in the format: 18650, 20650 and 21700 that you have encountered?

    Which are the worst cells in the format: 18650, 20650 and 21700 that you have encountered? In many years that I have walked this earth there have been a few cells that I have come to encounter in my work and my projects. Samsung 26F and its friends was the first cell that I abused. It came to...
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    What is the current largest capacity 21700 cell right now? - 2023 December 2nd.

    What is the current largest capacity 21700 cell right now? - 2023 December 2nd. To my knowledge the largest cells in the 21700 size should be somewhere between 5500-6000mah. Please specify the rated amps if possible example Name: Panasonic PF Rated: 10A Capacity: 2900MAH
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    How to modify a set voltage on a battery charger

    Now I'm working on a ev- charger with a relay and a set 520ohm resistor next to it. The output voltage of this 72v 8a charger is 88v. I want to lower the output voltage on this charger so I'm pondering about how to do it. If you have any idéa to get me on track, please let me know. My plan...
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    What´s the difference between a BMS with a C- and P- wire compared to one with a shared wire for C/P?

    What´s the difference between a BMS with a C- and P- wire compared to one with a shared wire for C/P? (C- Charger in minus, P- Power out minus) Please if someone can shed a light on this. Thanks There are of course other BMS functions as well but focus on the security side for hazardous events...
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    Suspect and odd voltages Dolphin case battery please join in and help

    Battery The problem. Unknown. What I suspect is that it has been manufactured in the wrong way at the minus poles as you shouldn't spot weld in the center of them. Can anyone give me any clue to what might be the issue. Any other hypothesises would be appreciated as main reason for this is...
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    Which hybrid electric car will be yours in the future?

    For me it will be a hybrid plug-in. Sad I have no use of one right now. Chevrolet volt or the sister car that is the same Opel Ampera is something I'm looking at in the future.
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    QS-motor phase wire upgrade + Sabvoton 350A

    Hey I want to know what benefit I get from thicker phase wires vs original thin wire in performance measures. Also positive and negative battery wires are replaced. I know the resistance in the wire is less and the voltage drop is less because of that. What performance gain in power and...
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    Making a small pack 5S24P

    Just some photos of my small pack I want to share How to assemble: Soldering exactly how: tesla style. One side is fused with wire capable of 5-15a max(deciding), the other more robust fastened with thicker copper wire. Both sides uses twined copper wire as busbar. Hot glue gun to make pack...
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    First battery build

    First time doing this. First battery build I need alot of power and battery and this first is a 4s16p block of about 550wh How I did it: I used the original stripes and boosted them with copper wick. One for the parallel and about four wicks in every series connection. I’d like some input...
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    What did you do before ES and what's your work now?

    Hey everyone who contributes to this great forum I would really like to know this: What did you do before ES and what's your work now? Mine story was like this: I saw the glimpse of this forum in late 2011 and thought. O whey cool. I started to read once in a while among other interesting...
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    27" IMAC ftw 378 dollars

    YO! Just picked up a Imac 27 older model... some kind of errors. So I just tried to solve what the problem was. Changed ram because of ram error. No hard drive so I had an old 320gb macbook 2010 mid put it in and it started. :D ALLTHOUGH I hadn't thought it would work directly but after...
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    11" or 270mm rear shocks? Help with length.

    Hi guys I mounted a long 11" shock for my rear and it just bottoms out when I ride. Really I can go on a straight good road and its bottoms out. Coil rating 300lbs This is an emergency solution. I could get one in a day but that one . The original was 8.5" or 220mm 500lbs coil and air. Its a...
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    New battery inside rear wheel

    Hi just now I spotted this ebike with an integrated battery inside ita rear wheel. It costs 1500$ on sale. Only sold in Sweden I think. 36v 8ah lithium battery inside the rear wheel Size of hub, like bafang motor or something, it doesn't look to big. Please se link for pictures...
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    Do you have or plan to start an ebike business?

    Lets find out how many people like to do ebike business in the future or do have one already. :D
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    BMS failed, help to replace with new...

    My 10AH limn2o4 bottle battery had its bms fail so i have a non working battery right now. Gate resisors burnt out, two of them(not the tiniest stuff but 2mmby4mm), on a 5cm by 5cm, double decker bms. I need help to buy a new bms, ebay have one for 40. Will this fit if i solder it correct to my...
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    Battery connection with connector 4(2+,2- goes +/-)SOLVED

    Mic plug, ham, c146, bottle battery connector, 4-pole, 4-pin I have a cable i need to insert into the middle one here in the picture. The left and right above is on the batteryside and where ill connect One of the middle ones to. I somehow lost my connector so bought new ones and I need help...
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    36v and 72v power ranger ebike

    I remember I was reading about this in the forum but then I was a newbie. I thought it was to difficult and more expensive but reading threads of action in this forum and looking at cool youtube videos. Learning about every little ebike part. I really like the idea to have a bike able to do both...
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    I finished my ebike today. All good but that my motor stops

    I finished my ebike today. All good but that my motor stops 0.2seconds and max 0.5 rpm of the wheel? Gm controller 48v with 48v10ah lithium bottle54.5v Any help appreciated Something blew and gave some light however still works like described above Thx (moderator edit: moved out of someone...
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