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One has to ideally set up as business and have good insurance, then there is the certification requirements and getting them from A2B. One can't ship cells/batteries willy nilly. There are 3 or 4 guys in the UK who carry out such bespoke builds or re-celling, there have been at least four...

Sorry to hear about your sister, I have been there so know how it feels. Covid has taken a lot of people over the last two years, yet the nay sayers are still about all over the world. I lost my elder sis 10 yrs & 8months ago from the big C and she was only 49.

Worth sending the pics of the cell damages as they may offer a replacement or a good discount on a new one, from what we hear they have good CS so wouldn't surprise me if they simply replace it.

How old is the battery ?

I'm not familiar with the KD21C and controller but think they are Lishui brand. I believe the system is a mix of speed control with some options of setting the power ratios. One gets a different max speed in each assist level, the power will drop off to nothing near the optimum speed but may...

Better known as Butterfly bars, they can be helpful if ungainly in there looks and style. Personally if the riding is only local errand or out for few hours I would opt for a swept bar and riding stance changes to find a more up right comfy position with nice bar end grips like GP2 or from the...

Those burnt cells are very likely dead and would read 0v, they will pull the parallel group down and no manner of balance or charging will alter the pack.

Those cell can burns are due to shorting out, the battery is unsafe and a liability. It needs recycling, as is it is a potential fire hazard. It is one reason as to why, that when folks have battery charge or cut out issues I always ask users to carry out a part battery autopsy to find a...

You need to get the BMS reinstated for your safety and the safety foremost of others if you live in a household or within a housing community. Also make sure your insurance is up to scratch as your battery in now a liability which you really don't understand. Where do you live in the world ?

Only a fool removes a BMS as not only does it stop low discharge and prevent the battery from becoming scrap it in most cases will deal with top end balancing during the charge process. One wouldn't want a cell seeing more then 4.2v for too long and a BMS prevents this. Some do go without a BMS...

I remember that one, his mate had bodged the wires with alternate coloured extenders and the guy took the polarity at face value and puff, up in smoke. As we keep saying a meter tells you correct polarity, it is such a simple technique to use, when someone else has played with electrics unknown...

If all checks out after 36/48hrs and the battery isn't 100% balanced put it back together and discharge it some and then try a full charge to balance out better. An even balance may take a couple or three charge /discharge attempts if all is well. Why one has discharged more so one won't know...

One can charge the two low groups up though you will need and old unused 5v 300/500ma cell phone charger or one can try modding a 5v usb cable. I prefer the former as the charge rate is very low and stable. One has to cut off the jack plug and then shrink a bit of Red on the 5v wire usually...

That shows up a bit different now showing #2 & 9 # at odds. #9 is the main culprit in drawing the pack down, effectively the pack is only operating at 35v despite the 41v accumulated charge as the lowest denominator controls the voltage. Under load #9 will quickly reach LVC at 3 - 3.2v causing...

You beat me to it. The way I describe gives the individual group reading, the accumulative method still come to the same conclusion. So as I thought one cell group is way out #3, #10 has wandered a bit. Trace/follow if poss #3 & #10 sense wire to the battery group to it's end for good...

Use the meter set to DC 20v. Find two needles or a pair of arduino pc pins, starting with the Black wire b-/0v and the one next door cell group #1 place a needle/pin in each female pin hole, probe the outer side of the needles for voltage and write it down as a #1. Next move the first needle/pin...

Logically thick Red/Black is voltage supply, thin Red a sw supply.

If you wired up your tv or house electrics like that they would go bang, one simply doesn't mix polarity's . I can only assume that the wiring is so mixed up colour wise that it is only luck that the polarity and wire sequence is correct.

It isn't cost effective to do your own if only a one off but for the inquisitive or someone wanting to learn/know more then it is a worthwhile venture for a couple hundred £££'s. I build all my own packs and have done so for 4 years or so, first I started by just making small 1s -3s batteries...

For the diy battery builder who is only doing repairs or builds for himself, then a decent mini arduino welder is best with a good high current discharge lipo 3s as a power source. This gives a lightweight highly portable system that takes up very little space in use and storage. Two of the...