Endless Sphere

Hi ESFMs, I recently had to replace my twist throttle after an incident on an escalator destroying my last throttle. The new throttle is a twist throttle with 3 speed wires and a voltage display wire. Ever since I've had it, I've noticed that it would display less voltage than normal. 54.1v instead ...

Hi ESFMs, I'm in the process of restoring and rebuilding a bike with an especially large front suspension fork. I plan to have a front rack on it but because it's a still fork with a welded on arch, I know I can't put on a brake mount and eyelet mount style rack. When I do that, either the arch star...

Hi ESFMs, I'm about to build my first pack using the vruzend v2 kit. I'm going for a 13S3P using preferably 3500mAh 10A 18650 cells. I'm looking around for reputible vendors at the best price possible. I've been looking on AliExpress, eBay and Amazon but knowing that there are a lot of fakes out the...

Hi ESFMs, I'm about to build my first pack using the vruzend v2 kit. I'm going for a 13S3P using preferably 3500mAh 10A 18650 cells. I'm looking around for reputible vendors at the best price possible. I've been looking on AliExpress, eBay and Amazon but knowing that there are a lot of fakes out the...

Hi ESFMs, I'm about to build my first battery pack using the vruzend v2 kit. I want to build a 13S3P using 3500mAh cells with a discharge reading of 10A. I'm looking around on eBay, AliExpress and Amazon and theres a lot of options. The most affordable ones are on AliExpress but I'm also aware that ...

Voltron wrote: ↑

Jan 28 2021 9:29am

JST? (Japan solderless terminal)

There are 3 types apparently. TP (thunder power), XH and hyperions. I think I might have TP but I'm not sure if they're 1mm or 2mm. I'm gonna have to order online an assortment. I can never get the right parts from my local stores in my neck of the woods.

What's the name of this type of connector exactly? Is this a TP connector? My local electronics stores don't have these.

I already asked you that Does that charger allow charging without the balance plug? We are not taking the time to write just for fun. If you don't know how to find out something so basic I really think you should not be messing about on this path by yourself. Find someone local to you to help might...

How do I know when it's charging? I identified the one series that's lower than the rest and I got a couple pieces of thin wire. I've confirmed that they're making contact through my multimeter. I've selected lipo setting and charge on 1s but this charger isn't giving me any indication that's is cha...

Now just make 2 probes that will fit in the holes in the balance plug (don't force anything too big in them and bend the terminals inside the plug, like a paperclip is usually too big, I've used thin solid strand insulated wire or tiny male jst 2 pin plug, but had to trim plastic off the body and t...

Voltron wrote: ↑

Jan 25 2021 3:48pm

Are you to where you have the balance wire plug exposed like this?
IMG_20200210_210612884.jpg

Yes.

I'm still trying to figure out how I'll be hooking up my balance charger to my 13s pack. All the tutorials show that you have to connect the output plugs into the charge/discharge leads of the pack but when I do that, I get an error message "connection break". I'm assuming that its because...

john61ct wrote: ↑

Jan 24 2021 3:48pm

FYI, a string means cells in series.

A group for in parallel.

So, just one group may be out of balance.

So, the singular form of series in this case is string? I've always felt awkward referring to one series as "series"

Well, chances are that it's probably just one series out of balance. I know that for sure on one pack. The other 2 I haven't checked yet.

I might find a 2 pin jst connector and work it that way.

Thanks guys. I'll keep y'all posted on my progress.

Can I use my 6s balance charger on my 13s pack? And can I charge it through the bms port? I'm thinking if I can get the 14 pin jst linked up to two 6 pin connectors and just rotate them? Would it work that easily? Id it safe to do it that way? I'm very new to this

Hi ESFMs I have a few batteries that are no longer charging fully. Some of them are quite new but have a cheap bms installed. Rather than throw out perfectly good packs, I want to learn to balance them (and maybe replaced their bms with good quality ones at some stage) I bought one of those iMax bal...

A quick update on my experience. The vendor for one of the packs sent me a replacement. This was the pack that started sparking up and burning a hole through its bag. I've been riding with it for only 20 days and already, it just started to not get a full charge. It stops charging at 53v, whereas it...

Hi ESFMs, Over the past few years I've gotten familiar with some of the major types of bike failure that can happen. I know how a blown fet in a controller shows up, I know what phase wire issues feel like and I know all about the dreaded Phantom throttle syndrome. What I haven't had the misfortune ...

I have a question about the UPP's BMS compatibility with my controller/motor setup. The BMS in these 14Ah packs are rated at 30A continuous and 90A peak. My controller is rated at 17A continuous and 35A peak. And my motor is 500 watts. I don't know what that means in terms of how many amps it can ta...

goatman wrote: ↑

Nov 09 2020 9:20pm

looks like you get to try and salvage some cells and make a new pack. i use cell holders and plasti-dip to waterproof

I like that idea. How do you recommend I should approach the dismantling process? How do I break the spot welds?

Those are the power FETs. It looks like you are putting a higher continuous load on the BMS than the FETs can handle without overheating. Sometime you can add a heat sink to resolve that but the better resolution is to use a higher power BMS. What amperage is the pack rated at? I was wondering abou...

And on the top side of the bms, I noticed 5 modules with the first 3 looking singed at the back. What are those things? This is my first bms autopsy.

The autopsy continues. Here a shot the bms that didn't burn. Well I guess it did.

Here's a shot of the "new" pack after I ripped open the packaging.

I suspect that the cardboard insulator used acts as a sponge and only serves to spread any moisture that happens to get in. I prefer it when they use the hard plastic like insulator.

Here are some pics of the 10 month old pack. I checked each series' voltage. There all around 4.1v except for that first one by the court wire bodging. It is on 0.33v

The month old pack is around 3.6v with the first series at 1.36v