Adjusting the KingSong S22 Charger Output 

Thank you for this! I've been asking about this for weeks haha both my s22's don't fully charge app usually says 99% but I still got 52mi on my range test =) Keep up the awesome work and videos bud!

Marty -- and by extension, Roger........Thanks for posting up this tip. A little backstory -- I'm a Brit who worked half my adult life in R&D in California, Texas and Washington State, I now live (and ride) in The Algarve in Portugal, where I am now retired. Six months ago bought a S22 Pro. Having never 'wheeled' before and new to this, I noticed when I reached a skill level enough for some adventure-riding onto trails for longer rides, that my wheel was slowly and incrementally no longer reaching 100% charge. In fact, topped out a couple of days ago at just 122volt and showing just 88% charge - I could not get it higher. Thinking at first, - and clutching-at-straws, that it was possibly due to low winter temperature effects, bringing my wheel indoors (from my unheated stand-alone motorcycle garage)....... had no improvement effects. So....... I tried your tip on moving the pot in the stock charger and it worked! I chased the pot increase bit-by--bit and now am back to 125.4 volts and showing 100% charge on both EUCWorld App and Kingsong App. I have concerns over how and why this happened, especially as looking at the BMS table for both battery banks, all cells are up to voltage (with no laggards!) and balanced to within 0.01volt of each other. Any idea if this fix addresses 'the disease' or just 'the symptom'? As the only euc rider in Southern Portugal (that I am aware of), I exist vicariously particularly through your posted videos -- as well as Roger's and Dawn's individual posts as well as your' combined group outings. So please keep posting. Safe Riding! .......... Tchau-Tchau............ Rick

Thank you :-)

I'm using the KingSong app (Android). Sounds like you had a real problem though.

Absolutely not. The amount that you can change the voltage is probably within a couple of volts.

Clockwise. A tiny bit.

Perfect, thnx Marty.

As I discussed in the preamble, I wanted to provide a solution for people who don't own a multimeter. In addition, the S22 charger does not output a charging voltage until it's attached to the wheel. So you would have to splice in some cables to read the voltage.

Another 2 reasons are: in order to measure the charger output voltage you need to do it before a relay inside the charger that activates current to the plug. Also it isn’t useful having the charger output the 126 V you would assume is correct as it does not get the wheel to charge to 126 V. This method actually will accomplish that goal.

Good points. I didn't want to get too far into the weeds so I skipped the relays details.

@@roghaj could i do this with my V5F... With any charger? Btw thanks to Marty for another thorough info/repair/diy video. 😀

@@JannoDL Normally this works with every charger. On old charger its even easier to put the voltage meter just on the Charge plug output and adjust then.

LOL Oh well :-)

Voltage

@@ElectricUnicycles okay thanks. Is there any way to increase the amperage ?

@@ShykeProdz No

LOL - thanks for that :-)

@@ElectricUnicycles Any time mate... happy to be of assistance

I don't believe in censorship or self-censorship. I prefer to treat people as adults and let them decide if it's worth it :-)

That's generally the case with Gotway wheels. The charge ports on KingSong wheels are not live so it doesn't really matter.

Ohhh gotcha that makes sense! Much appreciated

@@thefoss721 The FOSSss!!!!

@@drumbri haha yup that’s me ;) love the stoked energy brotha

I agree that the A2D converters that the wheels use is not instrument grade accurate. But for 100+ volt wheels the voltage is not off by more than 1-volt based on my measurements in the past. I do know that I'm getting more charge on the batteries with the higher output from the charger.

@@ElectricUnicycles i believe you - be careful not to get it over charged . these cells are like a bomb and playing with them is something I wouldn't do especially after the New York thing. If anything i want to charge it 10% less than maximum so I know I avoid heat and problems . I don't care riding less .

@@robertbarel896 Be sure to fully charge your wheel periodically (so the cells can be balanced by the BMS) otherwise your cells can become badly unbalanced which can also lead to a battery pack failure. Also, the BMS will not allow the wheel to be charged with too high of a voltage. All modern wheels will simply stop charging if too high of a voltage is present. Lots of safeguards in our 2020+ wheels 🙂

@@ElectricUnicycles it's true but I would leave the potentiometer and wouldn't touch it because I have no idea what is the real voltage . you will get more juice if you raise the voltage but I have no idea if it will turn out that overcharged your cells,

No. 50e's

I doubt this charger is capable of outputting too high of a voltage. When I increased it by ~1/8th of a turn, the charger LED's flashed continuously and the charger did not output a voltage.

There is a safety built into the wheel. If the voltage is higher than allowable it will display "Monomer overpressure"

Beside the other two answers. if you would adjust -for example- the charger to 127 Volt, that would not matter, as the BMS protects from overcharging and woud stop when reached full 4,2 Volts per cell.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-pgr7-b3eBm0.html

It's not a myth. Automaker like Tesla recommend this to prolong life of bateries. Even phone companies like Apple or Samsung do it.

@@DamianLesiuk it applies to single cells, tesla have active balancing in their packs that balances the cells so it's possible in their packs, on EUC packs we only balance at the end of the charge so if you do this on an EUC the cells will become unbalanced.

@@RonnieRides but isn't the S22 in this regard. It's the first wheel with smart BMS and I heard it can do active balancing without charging to 100... Just like the telsa. Is my information wrong?

@@SamClegg first the discussion regarding charging to 80% is generic and not specific to S22 and recommending it for EUCs is very bad. Second the Smart BMS on the KS is basically there to tell you the health of the packs and the cells, it still balances just as any other bms at the en of the charge cycle when the cells are over a certain threshold, now I believe you can set the threshold in the application in form of percentage, say 80%, what that means i practice I don't know.

I'm providing information to people. They can or cannot use it 🙂 And in this case the multimeter is not useful since the charger output is disabled until it's connected to the wheel.

this new type of charger (same as on GW Master btw) will not let you read the voltage from the charge plug as on other chargers. Reason is, the charging only starts after 4-5 seconds after beeing plugged in. Difficult to read the voltage via meter, you would need to unscrew the charger completly.

it won't cause the wheel to not brake... it will cause the cells to get overcharged (past 4.2 volts) - which is very bad for the lifespan of the cells

@@YourAubsome@ardubt so you guys don’t recommend doing this to the charger? A lot of people seem to say cell balancing is important, you disagree?

Nothing to worry about 🙂 Our wheel BMS's manage the input voltage (your charger output is not applied directly to the individual cells). If your charger puts out too high of a voltage, the BMS shuts down the charging process and nothing happens. All good 🙂

Yes last kingsong for me, the entire design of the upper half is a joke. Seat useless, charge ports and power position are terrible, trolly handle also worse ever on a euc, the flappy pos handle in the back.... also abysmal noone wants this and it's early yet but that 4 slider goofy suspension I know is going to require regular attention. I do feel safe on it, stable the ride is good suspension should have been air I find the spring to stiff not a smooth ride.