Begode Rs Resolute, the first EUC using LFP battery chemistry?

[Masa-san]

Hi! If the reviews of the owners of this model ?

[meepmeepmayer]

Someone claims to have one.

Quote:

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I’m not sure what to give people when doing a video so forgive me for whatever you hate. Just wanted to just finally get some kind of video out. No official speed and range test. Just showing a quick ride and feel of the wheel. Did a little Euc burnout, lift cutoff no load, and use of the lift cutoff switch. And for the people asking about my speakers touching the ground I hope you can see the ground clearance. It totally works out. Even in tight turns. From the information I’m getting this should be the first ever video of a Resolute. I’m not by any means trying to promote this wheel. It’s just the wheel I bought with no relevant info online. I just can’t understand why you can find videos on an Airwheel but nothing on the Resolute. Hopefully this will help change that. Anyway, enjoy.

[EMA]

something to read by ecodrift

https://ecodrift.ru/2022/05/06/begode-new-rs-116v/

[rumpel]

Hi is there really an euc with lithium ion phosphate to buy. There were plenty of information about Begode Resolute  but I'm unable to find any sorce where I could order it . Could you send a link. I live in EU.

[wheeler]

are there any known fires for EUCs with LFP batteries?

I think these are the ones with LFP:

begode RS

inventist solowheel classic

inventist soloweel extreme

inventist solowheel scorpion

 

 

[Brendan "nog3" Halliday]

5 hours ago, wheeler said:

are there any known fires for EUCs with LFP batteries?

I think these are the ones with LFP:

begode RS

inventist solowheel classic

inventist soloweel extreme

inventist solowheel scorpion

 

 

no fire only smoke

[ZweemZ]

On 3/22/2022 at 9:56 AM, Freestyler said:

The RS LFP edition, includes a SOC (state of charge) in its bluetooth packets  

That was expected of course, since you cannot calculate SOC from voltage in LFP (the discharge is not linear).

I just ordered AR's overstock, I was hoping to preserve the LiFePo battery system. AR is vague about what the issue with charging these were, I read that quite a few of them would stop accepting a charge after 2 min.

Does anyone have any suggestions, or advice on the matter? seems futile if the charger cant tell the state of charge, not sure how some people seemed to be able to charge, just luck?

Im wondering if using a hyper charger to manually charge at a lower current, lower amps, could that possibly mitigate this issue in any way.

 

[ZweemZ]

On 2/6/2024 at 9:55 AM, ZweemZ said:

I just ordered AR's overstock, I was hoping to preserve the LiFePo battery system. AR is vague about what the issue with charging these were, I read that quite a few of them would stop accepting a charge after 2 min.

Does anyone have any suggestions, or advice on the matter? seems futile if the charger cant tell the state of charge, not sure how some people seemed to be able to charge, just luck?

Im wondering if using a hyper charger to manually charge at a lower current, lower amps, could that possibly mitigate this issue in any way.

 

Okay, so its been about 2-3 weeks since recieving my Resolute, It was a return, had less than 40 miles on it, looked brand new, and thankfully it came with batteries. I'm leaving a record of my findings, in mostly laymens terms, in the event that someone gets their hands on one and is trying to wrap their heads around it, perhaps restore it, or start a LiFePo4 powered PEV project and use this as reference. I am at best an amatuer PEV modder and UNI enthusiast, I am not an electrical engineer, I learned what little I know regarding this project, through various internet resources, telegram group feedback, and through some knowlegable friends and their hands on assistance, some who are degreed electrical engineers, nonetheless I am open to feedback and correction on this project. Again, there is a fair bit of SPECULATION here.

***one of the obvious issues, It seems as though the LFP cells that they used are somewhat "underpowered," for the output that the board is demanding, discussed in the reply below***

Ther are a few issues with the way these packs are set up to charge. Firstly, apparently, it is speculated, that Begode is using a BMS that has charging logic for Li-Ion, it initiates top ballancing close to the max state of charge of Li-Ion cells, when cells approach ~4.2v, which LiFePo4 cells should never reach, LFP max voltage is 3.65v. As a result the individual cells in the packs, dont go through top ballancing, can get wildly thrown out of ballance, some of it due to the chemestry's particular end of charge cycle needs.

The previous stated issue, will likely get exhaserbated by the following issue, which is that they configured both packs to be in series. The two 16s 3p packs become 32s 3p.  Apparently the logic board they developed to attempt to mannage the two packs, it wassnt so great, or maybe doesnt work well with battery packs that have the dysfunction this BMS had. I've been told that this pack managment board worked not to ballance, at least in the conventional concept, by simply draining the higher pack into the lower pack, no, apparently the board was there to essentially bridge and manage the last cell group of one pack (a theoretical "-B16"), to the first cell group of the other pack ("-B17"). All this seems to be their attempt to allow use of a single charger, either to save production cost, and/or to also make it more convienient for the user. If you use a single 116v charger, you essentially need one single BMS as well, but I'm guessing they didnt want to fabricate an entirly new BMS system for just this one wheel.

The supplied charger is programed to treat the series connection as if it is one 116.8v battery. In a perfect world, both packs reach 58.4v at the same exact time, and the the critical 2nd, and final phase of charging, occurs at the same time for each pack, it cuts the power, and there is no problem. Instead, the series reads 116.8v, and one pack is higher than 58.4 and the other is equally lower, which leads to the 2nd phase of the charge occurring prematurly for the lower voltage pack which has an altering affect on final atate of charge. LFP cells have a specific approach to charging and it is critical that they reach their top charge with a specific saturation of current at the second and final phase at a specific stage, both packs are essentially getting this phase of chare at different stages. Also, the over voltage pack has cells that are over burddened because LFP are particularly sensitive to over voltage, potentially affecting the internal resistance of the packs. and the lower voltage packs could be vulnerable to undervoltage at the end of the charge cycle.

Ive been told of a third unconfirmed issue, the theory that the charger they supplied is anything but a LifePo charger, some suggest it's actually a LiPo charger, either way, it literally says "Li-Ion charger" on the label lol, not a good look, because Li-Ion charging doensnt have a cc/cv 2 phase charge cycle.

So yeah 3 strikes from Begode, no wonder why this thing flopped... JK its a great wheel if you buy two 58.4v LifePo4 chargers, and wire up indipendant charging, you could do what I did, and internally wire up the unused pin in the 3pin port, as a common pin, and fabricating a Y connector configured to utilize both chargers into that pin accordingly. I would strongly suggest to eventually wire up two LiFePo4 BMSs, 40-80 amps are fine, since you will likely cross the blue and black leads to bypass the overvoltage/undervoltage cutoff logic common to BMSs. All in all, about $100-150 total for everything.

I took out the pack to pack bridging circuit board since i wont be charging in series a lot. the solution I described above, still allows me to charge in series like normal, so I can use a single 116v hyper charger if in an emergency, again, this is using the same GX-20 3 pin charge port it came with (utilizing 1+, 3- as it is with stock).  and once again, the more common way I will be charging, day to day, to best ballance out pack to pack voltage, is to charge each pack indipendantly. With the help of a friend, we wired it internally to utilize the unused pin (pin 2) as a common pin, to supply the negative and positive compliment to the 1at and 3rd pins (see picture). we also fabricated a Y splitter in such away that it allows each charger leads to orient them selves to access the pins accordingly.

Simultaniusly charging each pack with their own individual charger, that was rated for LiFePo4 charging, at 58.4v ensures each pack reaches that 2nd charge phaze fully, and nearly identical, and they both come to rest to the same SOC at the same time. By simply doing that, I was able to bring the voltage divergence that had been apparent, from a pretty substantial 1.5v, down to 0.2v, and I am confident that this is going to allow me to keep this thing running for a while, untill I also get a proper BMS on these packs to also help with the imballances happening within each pack. Nonetheless, the dedicated chargers at least help the packs get used in a consistant manner and that will keep their average resistance about the same. I chose to remove the circuit board that was managing the two packs, since I wassnt going to charge in series much any more, and I wassnt sure what it really was doing good/bad.

I really like this wheel, I bought another one, and I was sent a new one, so I can install a BMS and never use series charging on thaat one and I should be golden for 4000 charge cycles. What I have not seen people discuuss about this wheel is LFPs ability to charge safely at 4C, thats 18amps, ~+2100 Watts!! thats 30 min from basement to the roof, I've done it, again, that's 60mph charging! Technically dependant on charger availability this factor makes up for its range deficiency compared to a lot of wheels in its class that can barely charge above 1kw.

One annoying thing, is that the 2nd alarm beeper on mine seems to be going off at about 35 mph @90% (3 miles in), then 25mph @60% (10 miles), then like 20mph @15% (20 miles). And I spoke to another owner, and he says to ignore it, he believes its hardwired into the board, he also claims that it stops beeping as he goes closer to 40mph, something to do with the way stock RS logic for over charge alarm > 103v. he said that he simply unplugged his own beeper. I have since been pushing it harder and harder, well into these beeps, I can probabaly go 10-15 mph into them, my top speed has been 36mph, I am 150lbs, I know I can push harder but I'm in no need to prove anything just yet. FTR people hav said that its top speed stands between the HT(37mph) and HS RS (47), at 42mph, which is good to know since the only thing keeping me from the RS HT was the 37mph top speed.

This thing is rock solid, I love the high torque, tactical non susspension feel weaving through nyc traffic, I'm local to the scene here so range isn't much of a concern for me, and this battery chemestry doesnt get any softer or less zippy as Im ussing it, its very consistant from beggining to end, the made up 3000w motor rating is 400w higher than my friends MSP HT, and if that has any placebo affect, it does have a satisfying feel for the class of wheel it is, it's hard to step off of.

Why did I buy this? firstly I had an M50T celled MSP Burn up my entire house, and to get over my ptsd, I bought a wheel that looks identical to it, but "RESOLVES" a repurposed post-traumatic lifestyle. Thankfully no one was hurt in the fire, it could have been worss, but I was homeless in the middle of winter last year, and thankfully I was able to eventually move back in, but my building complex banned PEVs, so I keep my unis in storage a few blocks away, and for 8 months now, I had been locking an electric commuter scooter with an ipx6 rating, outside to keep some level of convienience similar to before the ban, I was charging it at work. I have retired the escooter, and replaced it with the Resolute, because I was tired of getting laughed at for showing up on a scooter places, and more importantly it gives me the peace of mind, that I can charge it at work and not be anxious about it causeing a fire, since I choose to store it on the streets in the weather.

You can trash on this wheel all you want, but when your stuck riding a scooter, and you have PTSD and almost died in your sleep, this thing, this thing almost makes up for everything LMFAO!!! Seriously though, experiencing a PEV related fire, will change your opinion on a wheel like this.

Could I reccomend people lock their wheel up, well, the location I lock it up is wide open, consistant traffic, and most importantly within eyeshot of 24/7 security and like 4 cameras, I'm using the same two anti-grinder attack U-locks that have protected the scooter from attempts for 8 months prior. The 20 inch rims on RS/MSPs are great for locking up with the open spokes. Water proofing is critical, and I plan on getting the bearings sealed and motor windings shellacked, circuitry dipped, seams siliconed, thats also why the trolly handel is outside of the shell, on the rollcage so i can plug the shell opening for it. That is why I have the splyce guard roll cage on it, we joke that it's literally homeless, so homeless it looks like a shopping cart lol. The roll cage serves as an extra measure of tamper resistance to keep thieves from prying out the bateries easilly, its also ugly AF on purpose, which adds anti theft points.

K, enough of my backstory (btw I won the Broadway Bomb last year!! on a 100v Commander LETS GOOO!!!) So one last thing, If you recieve these pack in non functioning, or dysfunctioning order measure the value of the white wire, to the black wire to read the internal resistance of the packs to determine if there may be dead or damaged cells, 0v means your fine, measuring 10v seems to indicate that there is some resistance worth investigating, check the internal resistance and voltage of every cell, you may need to replace cells, may need to utilize an active ballancer if the cells are conciderably off. Again, though not immediatly necessary, esp if you charge each pack indipendantly, a propper Lifepo4 bms would likely be something you would want to have already done before potentially having these packs get out of hand.

m

 

Edited March 2 by ZweemZ

[ZweemZ]

Another issue that people have speculated, which seems like a fundimental flaw, in 3 series, these cells only deliver 27amps max, (18a cont.) compared to ~50a, 60a, even 80amp max output of other cells used in the MSX-MSP-RS, also the motor is rated at 3000w, 1000w higher than the msx, 400w more than the msp ht, that could also be why these batteries were failing, the motor was demanding way too much from them. Also, people susspect that breaking could be overvolting these cells which LFP are particularly sensitive to. esp since the soc sits consistantly high up all the time. so something to be aware of when you are riding this wheel. ride it to the performance of a tesla and you should be fine I guess.

Regarding the Charging Mod pictured above:

Athough the pictures infer, through text, I dont picture the wiring (3 wires) that leads from the inside of the charge port pins, leading to the rerouteded internal wiring adaptor.  I dont have a picture to show the wiring from the 3 internal Gx20 pins to mt60 (you can use any 3pin connector).

you would use your choice of 3 pin connector there. I got fancy and used a slightly more descrete mt60 connector for that tighter spaced area, when I could have just continued to use the same MR60 connectors that I had laying around, from wiring up the connections to the batteries that use them.

Supply list:

- Multi-meter
- Soldering iron
- Solder
- Flux
- Female GX-20 3pin (maybe an extra)
- 2 female xt-60 connectors (might want extra)
- 3 male xt-60 connectors (might want extra)
- 3 male MR60 connectors
- Shrink tube
- 2 meters if red 12 awg marine grade silicone stranded wire
- 1 meter of 14 awg marine grade silicone stranded wire, you can get away with 16awg, not great for the fastest you can charge this at 18amps.
- Or you can probably be fine using 10ft of 14 awg red/black for everything instead
- Wire nuts
- Electrical tape.
- Two 58.4v LiFePo chargers, 5, 10, or up to 15, even 20 amps. Aliexpress are going to be half the price over amazon.