Endless Sphere

I read of a scooter manufacturer that solved this by providing chargers that would not fully charge the batteries. A problem was later discovered that this voltage was below the BMS balancing voltage. In this case, the user fully charged the scooter (actually not an ebike but a scooter) and straight...

I've seen many cases with broken e-bikes+electrical scooters when using regenerative braking on a fully charged battery.
What is most likely to break in such a combination, fully engage regenerative breaking + fully charged battery, the controller, battery cells or BMS?

You probably got error code 22/35 but didn't notice it on the display.
Happens to me too. I just power cycle and it works again.

In most EU countries, the maximum motor rating is 250w for e-bikes and electrical scooters. Now is it that this motor rating is actually the combination of the controller and motor? If i use an electrical motor that can handle 2000w but i use a controller that does not output more current/voltage ne...

I have about 50cm 4AWG pure copper cable on the input. Should i shorten them because of inductance? What is the downside of worse inductance? I'd rather not because of the size of the car battery :) What a wonderful piece of welder :) Thanks 8) I am explaining the theory behind wire inductance in d...

Thanks folks. I will see what to do. This battery is from a German made hair trimmer. =)

I have about 50cm 4AWG pure copper cable on the input.
Should i shorten them because of inductance? What is the downside of worse inductance? I'd rather not because of the size of the car battery

What a wonderful piece of welder

I'm trying to find such a weldable Blade receptacle but can't find anything alike. It is 2.8 mm and the material is either copper or nickel as it is weldable. I tried to weld a similar Blade receptacle made out of brass and it didn't go well :o I don't know if you can weld brass to batteries. Blade ...

Thanks for the response all. Some of the information is a bit difficult to understand but i'm digesting and learning. Also, this charger is charging none critical/expensive batteries so it's not the end of the world. I just need to learn more incase this would happen the day i started charging expen...

I bought a charger to a 10s battery pack and it measures 42.3 volts. Now that will over charge each cell a bit to 4.23v or will a good Bms kick in and stop at 42.0v?
Should I be concerned?

I'm the guy that usually charges to 3.8-4v to extend battery life.

thunderheart wrote: ↑

Jul 26 2019 9:00am

eikido wrote: ↑

Jul 26 2019 8:35am

But this cell has to be a re-wrap?

Why it has to be a re-wrap?

Because I'm chocked that the Chinese are doing it really well now

But this cell has to be a re-wrap?

I'm quiet sure i will be fine with 0.15x7-8mm but if 0.2mm is easy for the kweld, why not go with 0.2mm directly? I'd probably never hit more than 10amps per cell. I guess i will be somewhere 3-5 amps. And you never know, all of a sudden I start building batteries for power tools which requires a lo...

How does kweld weld 0.2mm pure nickel for you guys? I understand it depends on the power supply but i'd love to hear how it's going for you guys.
This is the last detail i'm unsure of. Order 0.15 mm or 0.20 mm.

I'm learning a lot.

Will someone please be kind and explain why something like kSupply exists? Why can't i just connect an appropriate/cheap power supply up to 8.1v to the kCap? However 2s 18650 wouldn't work->4.2x2=8.4v? The main reason why I developed that module was that I realized that the welder not only requires...

I would like to create a poll but it doesn't seem possible for me but i would love to hear what nickel strip size you use.

I'm getting a kweld.
I've made up my mind.
I'm just considering a kcap but I'm not really sure.
And the kcap needs a power supply.

john61ct wrote: ↑

Jul 22 2019 11:37am

30V and 10A max?

really?

Sorry I just found a link and pasted it without reading the specs.
The 30v spec is good but what rated max current should I look for?
Or Maybe thats just a bad idea?

Will someone please be kind and explain why something like kSupply exists? Why can't i just connect an appropriate/cheap power supply up to 8.1v to the kCap? However 2s 18650 wouldn't work->4.2x2=8.4v? Because cheap powersuplies dont have current limiting system and will destroy thenselves because ...

Will someone please be kind and explain why something like kSupply exists?
Why can't i just connect an appropriate/cheap power supply up to 8.1v to the kCap?
However 2s 18650 wouldn't work->4.2x2=8.4v?

Of course the malectrics allows the builder to adjust the welding pulse-time manually, but the actual amount of energy delivered is entirely up to the output of the battery that is used. If you are welding the common 0.15 nickel strips, it appears to function quite well. (I haven't used one yet, bu...

The main feature appears to this devices ability to measure the current passing through it in real-time, and it automatically adjusts the pulse timing on the fly to compensate for any change in voltage, or amperage droop. If you have a large low-resistance battery (*or possibly two in parallel?), t...

If i'm not mistaken, the Cycle Satiator can estimate a battery packs capacity since it calculates the Ah charged?
That is if it's still fresh or bad.

no, doing full charges negates the whole point of not doing them. you need a programmable bms that can manually set the balance voltage to 4v and a charger that is set to 65-ish volt. Ok. I will do as i've done previously. Charge to 80-90% manually and from time to time charge to 100%+ to balance. ...

for the normal usage here i recommend just sticking to 4.05~4.1V range. you gain a lot of lifespan by just going to 4.1v (or slighty under). going lower is not that interesting for most people here as the battery packs are too small and simply die because of being ridden too hard. lowering to 4.05~...