Planemo Posted June 23, 2022 Share Posted June 23, 2022 I have heard via Faceache that someone had a BT LOY error on a Max. I was very surprised by this. There was mention made that this is related to a problem with US sourced packs. Treat neither of these statements as fact, I just wanted to know if anyone here knows anything about this. Quote Link to comment Share on other sites More sharing options...
goos3man Posted June 23, 2022 Share Posted June 23, 2022 Yes, I saw a video of the error; there's apparently two people (or more now?) So we all know at this point that there are 'bms protector' 3d pieces for the original sherman. I don't believe they've been specifically modified for the shermax's litech setup - there is supposed protrusion in comparison to the begode batteries which might cause wear. If this is contributing to the bms problem that was previously seen from the og sherman panels rubbing, we'll find out soon enough. Quote Link to comment Share on other sites More sharing options...
Planemo Posted June 23, 2022 Author Share Posted June 23, 2022 OK I guess that makes sense. Theres every chance that the component protrusions on the LiTech BMS' are in different locations to those on the Veteran packs. Firstly that would make all the rib removal they did null and void. Secondly if the components are indeed even higher on the Litech packs, the stock spacers that Veteran installed on the later models might not be tall enough as you say. Personally I would rather see rib removal in the correct place than extending the spacers even more as all it would do is put unnecessary strain on the side panel screws. Interesting, thanks for that. Quote Link to comment Share on other sites More sharing options...
fbhb Posted June 23, 2022 Share Posted June 23, 2022 (edited) 5 hours ago, Planemo said: Personally I would rather see rib removal in the correct place than extending the spacers even more as all it would do is put unnecessary strain on the side panel screws. The Sherman Max side panels Already have All the ribs removed from factory (the inside surface is completely smooth), making this recent BMS issue even more curious IMO! Edited June 23, 2022 by fbhb 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Planemo Posted June 23, 2022 Author Popular Post Share Posted June 23, 2022 Wow I didn't know the Max panels were different. So Veteran clearly knew that space was at a premium when going to the 21700's. I guess that somewhere down the line there wasn't enough testing/measuring done when the Litech BMS' were used. I'm kinda thinking thats not Veterans fault though...did they themselves officially market LiTech versions? In fact I didn't know that LiTech Shermans were available, I thought it was just some Begode wheels Personally I would rather have panels that were made 4mm wider and use a very dense 4mm foam, rather than the skinny, soft 1mm stuff thats used on Begode/Veteran wheels. Doing so would probably have negated all these rib/clearance issues from the outset. 2 2 Quote Link to comment Share on other sites More sharing options...
fbhb Posted June 24, 2022 Share Posted June 24, 2022 (edited) 3 hours ago, Planemo said: In fact I didn't know that LiTech Shermans were available, I thought it was just some Begode wheels Begode never made Any LiTech wheels, as ONLY @Jason McNeil/eWheels have the exclusive relationship with LiTech for Veteran and Begode wheels. You'll remember there was a drama recently with Begode taking pre-orders for the Master on the basis of LiTech packs being fitted, when that was Never gonna happen! From the several reports I've heard of so far, the Sherman Max BMS issues have All been eWheels versions, but I do stand to be corrected on that fact. Edited June 24, 2022 by fbhb 1 Quote Link to comment Share on other sites More sharing options...
Planemo Posted June 24, 2022 Author Share Posted June 24, 2022 Yeah sorry I didn't word that very well. I meant I thought that only Begode wheels were supplied with LiTech (from Jason), not Veteran wheels. But I guess he's doing Veterans as well. Not sure why, it's not exactly like Shermans have a habit of going nuclear. In fact, aside from the early BMS/rib problems I don't think theres been many issues at all on stock Sherman cells/BMS'. So this could be yet another headache for Jason then... 1 2 Quote Link to comment Share on other sites More sharing options...
Popular Post MaxMan Posted July 2, 2022 Popular Post Share Posted July 2, 2022 I’m a Max owner with a BT LOY issue. I only noticed it because I decided to do a range test. My use case is commuting, and the error appeared around the 80-90 mile mark after I’d run the battery down over the course of a week or so. I noticed extreme tiltback when I should have had enough battery for 20+more miles and I started investigating. After some back and forth with Jason, I shipped my wheel to him for a warranty repair. He’s had the wheel since May, and it looks like his BMS supplier may have just finished a repair. According to FexEx, it looks like I will get my wheel back sometime in the next week. I’ll see how it performs. 5 Quote Link to comment Share on other sites More sharing options...
RagingGrandpa Posted July 5, 2022 Share Posted July 5, 2022 On 7/2/2022 at 9:55 AM, MaxMan said: (ewheels) Max owner with a BT LOY issue I've got a local rider in the same situation... sad to see. On 6/23/2022 at 10:50 AM, Planemo said: component protrusions on the LiTech BMS' are in different locations LiTech SherMax packs used an additional, inline PCB, last we saw... a very different layout than Leaperkim's packs. On 1/10/2022 at 11:42 AM, RagingGrandpa said: deployed to Sherman Max now: https://www.facebook.com/groups/509001630141079/posts/652895425751698/ (eWheels' site says the cells are 21700 50E) With so little room left inside the Sherm shell, looks like they had to use a daughterboard to package the 'tall' components (shutoff FETs). It'll keep them from being crushed and damaged from impact to the side of the EUC, ok. Hope all the leads are logic signals and not direct to cells... 1 Quote Link to comment Share on other sites More sharing options...
Paradox Posted July 5, 2022 Share Posted July 5, 2022 On 7/2/2022 at 8:55 AM, MaxMan said: He’s had the wheel since May, and it looks like his BMS supplier may have just finished a repair. According to FexEx, it looks like I will get my wheel back sometime in the next week. I’ll see how it performs. Keep us updated. There are probably many people on the fence at the moment. 1 Quote Link to comment Share on other sites More sharing options...
GH0ST Posted July 11, 2022 Share Posted July 11, 2022 I had the same issue on the original Sherman I bought earlier this year so not sure if it only happens to the Max. Technically it happened on 2 as the replacement for the first one also had the same problem. Both were brand new. What ended up happening was the first one I sent back was fixed by the seller and returned to me and has been working great ever since. I did ask what the issue was and was told that the first wheel had unbalanced batteries and it was fixed easily. I asked if it was something I could have done to fix it and was told that their technician had to open and balance it so it's probably not something that I could do. By the way the dealer (Freemotion) I bought it from was great and I did not have to pay any of the shipping cost to return the wheels. 3 Quote Link to comment Share on other sites More sharing options...
Popular Post MaxMan Posted July 14, 2022 Popular Post Share Posted July 14, 2022 On 7/2/2022 at 6:55 AM, MaxMan said: I’m a Max owner with a BT LOY issue. I only noticed it because I decided to do a range test. My use case is commuting, and the error appeared around the 80-90 mile mark after I’d run the battery down over the course of a week or so. I noticed extreme tiltback when I should have had enough battery for 20+more miles and I started investigating. After some back and forth with Jason, I shipped my wheel to him for a warranty repair. He’s had the wheel since May, and it looks like his BMS supplier may have just finished a repair. According to FexEx, it looks like I will get my wheel back sometime in the next week. I’ll see how it performs. Welp, bad news folks. I was pretty stoked to get my wheel back. I bought the Shermax as a commuter, and I’d been riding my bike while it was out for repair. Once I got my wheel back I charged it overnight and gave the packs plenty of time to balance. I checked the pack voltages each morning before heading to work, and I commuted normally for almost a week. It was really nice to have the freedom to take the scenic routes, and I missed the effortless speed. Unfortunately my good vibes didn’t last long. I was heading home a few days ago (with the odo showing ~60 miles since last charge and approx 60% battery) when I heard a random beep. I’m no speed demon. I usually cruise no faster than 30 or 35, and generally only do that when I need to keep up with traffic. A few minutes later the wheel began an extreme tilt back, and I had to struggle to pilot it to a safe stopping point. The “bt lo” error had returned, and appeared to be worse than before. I couldn’t get the error to go away, and at one point the wheel wouldn’t balance. I couldn’t trolley it, and I had to carry/roll it to transit to get myself home. It was a pretty frustrating experience. I can’t use the Shermax as a commuter if it can throw a catastrophic error code at random. I’m sending the wheel back, and eWheels has agreed to a refund. I’m pretty bummed that the Shermax didn’t work out, particularly given its reputation for reliability. Unfortunately that reputation didn’t match my experience. I’m also bummed that across the industry the various wheels appear to have differing catastrophic errors that appear at random. In my case extreme tilt back may be a relatively benign penalty, at least compared to the cutoffs that V12 owners report, or the Gotway fires. I really want an EUC for my use case, but the state of the market has me wary, and I’m considering sitting things out until the manufacturers put out products that can pass consumer products safety tests. 4 1 Quote Link to comment Share on other sites More sharing options...
Phi1osopher Posted July 15, 2022 Share Posted July 15, 2022 I am a Sherman Max owner that started experiencing extreme tiltback going 20-something mph with 90% battery charge. It is now displaying the "bt LoY" warning. Batteries are fully charged, indicating 99.5 on both sides, as measured at the XT90 connectors with everything unplugged. It will ride normally about 300 feet then fully tilt back. no beeps. Working on finding a solution. Quote Link to comment Share on other sites More sharing options...
Paradox Posted July 15, 2022 Share Posted July 15, 2022 8 minutes ago, Phi1osopher said: Working on finding a solution. Contact your reseller. It's a bms error. 1 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Phi1osopher Posted August 1, 2022 Popular Post Share Posted August 1, 2022 (edited) Thank you. EWheels had me return my Sherman Max (right) battery packs to be repaired. I got it back abut 2 weeks later, apparently good as new. Edited August 1, 2022 by Phi1osopher 4 Quote Link to comment Share on other sites More sharing options...
Jay inn Posted August 2, 2022 Share Posted August 2, 2022 I also have the BT LOY issue. So it looks like there is a BMS on both batteries. So I’ve unplugged my left side battery pack, powered it back on and the BT LOY error message was still there. Then I plugged it back in and unplug the right side battery pack, powered it back on and voilà the BT LOY error message is gone the tilt back is gone and I can ride it upright again. Yes….! Feels so great I got my baby back….??? My question now is can/should I ride my Sherman with only one battery, will it do any damage the battery management system or mess anything else up? Should I ride it until my new (right side) BMS is replaced/repaired or my best bet is to wait till its fix to avoid further damage to my beloved Sherman.? Thank you in advance for any help or advice. Much appreciate it! Best Regards 1 Quote Link to comment Share on other sites More sharing options...
Jay inn Posted August 2, 2022 Share Posted August 2, 2022 On 8/1/2022 at 1:06 PM, Phi1osopher said: Thank you. EWheels had me return my Sherman Max (right) battery packs to be repaired. I got it back abut 2 weeks later, apparently good as new. All right you did get it fixed. Congratulations man I know it sucks with a Sherman broken. Happy riding bro. Quote Link to comment Share on other sites More sharing options...
Popular Post RagingGrandpa Posted August 2, 2022 Popular Post Share Posted August 2, 2022 58 minutes ago, Jay inn said: can/should I ride my Sherman with only one battery It's dangerous because the overcurrent safety shutoff in one battery may trip unwantedly during normal riding, and cause a crash. The EUC was intended to have two batteries supplying the current all the time, and it may fail or become damaged from riding with half of the battery present. If you must ride with one pack only: gear up, and keep it slow. 4 Quote Link to comment Share on other sites More sharing options...
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