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trevmar

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About trevmar

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    Advanced Member
  • Birthday 11/14/1948

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  • Location
    California
  • EUC
    several MiniPRO (modified), Airwheel S5

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  1. Maybe your older unit has lost the key-coding, and needs to be re-paired with a new coding. The YouTube video showing how to do that is here: https://www.youtube.com/watch?v=ceLkAwDZa7k The board on which the pairing switch is located is the power relay board, controlled by the remote control. So if you need to look further to get the S5 working, that would be a good place to start... The S5 has been discontinued, AFAIK, and last time I looked, it was not available on Flash-Ecom either. Incidentally, I notice that the Airwheel Aliexpress store is selling spare S3/S5 handlebars for $90 shipped, and I am tempted to get a spare. Problem is, these machines are so reliable I haven't started to crash and crush ours yet
  2. @Groundcrew Both my Airwheel S5's delivered in 2019 had exactly the same app board as in your second photo, tucked next to one of the speakers, which is missing (the newly delivered units only have one speaker). That app board continues working even after you unplug the board near the power and charging switch (between the plastic cover and the metal plate you stand on). That board near the charging connector connects your Bluetooth music to the speaker, and also delivers your annoying "don't go to fast" messages. Mine has been left disconnected
  3. I have no idea what an S8+ is, are you sure there is any difference between it and the S?. All I can see is that it has a >200 watt battery rather than a smaller one. The Chinese factories are sending me emails saying they are open for business again, even Shenzhen...
  4. This is the page I see the board at $49.99 plus $5 shipping: https://www.aliexpress.com/item/4000141072554.html?spm=2114.12010615.8148356.70.65c927b8kAmVnB But it may not be the motherboard which is faulty, it may just need a system reset. Airwheel used to have support in the USA but they were forced to close the US operation under pressure from the Segway patent holders (the Chinese Xiaomi company IIRC) a year or more ago. My airwheels have never broken down (or even reached any limits) so I really don't know what they do when faced with overload. The MiniPRO was easy to diagnose - it just threw you onto the ground to protect its own hardware from overload. The S8 is pretty complex to work on, though. Take a look at this video to get a better understaunding of what could go wrong:
  5. In my experience the Ninebot MiniPRO products are not reliable enough for an application like yours. I have four in a corner here, shelved in favor of my two Airwheel S5. The Ninebot was breaking too many of my limbs... it is just not made for folk with a weight approaching 100Kg. Incidentally, I noticed that a new mother-board for the S8 is available on AliExpress for $49 plus a few dollars shipping. Typically, when a device like this fails it is taken to the local "bikeshop," which in China are located in every residential unit. I remember one in Chengdu which did its arc-welding on the outside (concrete) footpath, quite an experience to walk past unexpectedly! These shops repair bicycles, scooters, motorcycles, just about everything ... To them the replacement of a motherboard is a trivial task. Problem is, in the West we have lost these "neighborhood handymen," so when the Chinese technology is all that meets our needs, as in the case with the Airwheel S8, we are dealing with products and spares not really made for an absence of such craftsmen. That is why forums such as these exist - to connect the various hobbyists outside of China who need to crowdsource their questions and their tips
  6. I haven't had any problems with either of my (large) Airwheel S5's. Keeping Lithium Ion batteries running with for long life with plenty of charge is difficult. I would think you need, at least, a digital voltmeter. Also, the battery packs on these small platforms are too small, and if you are running the unit near its capacity for more than a few seconds, the battery voltage will fall due to the load you are putting on it. Also, the batteries will heat up as time goes by. Both of these can send the unit into a low-voltage warning. Wait a minute or two until the batteries cool down again and they could well function normally until you push them too hard again. This is the reason I gave up on the smaller platforms and went for the S5, with its much larger battery capacity. Even then, if I ride for 5 minutes to the top of the hills above our house the battery drops until it has only one or two bars left (the S5 has a display on its handlebars so that I can see the battery level more conveniently). I have to let it cool by riding it less aggressively until the voltage builds back up to a more reasonable level.
  7. Thommy, most modern lithium-Ion cells do not age so quickly if the charge voltage is kept below 3.96 volts (approx, varies from cell to cell). The biggest increase in life is lowering the charge voltage from 4.2 to 4.1 volts, where the life doubles for many cells (from 500 to 1000 cycles for 20% degradation). Every manufacturer is different, but it is a good general rule to keep the voltage on any cell below 4.1V and preferably below 4.0V, which for a 16 cell pack is 64.0V. One complication is that the BMS often is not precise in balancing the charge into cells, and it is recommended to charge right up to 4.2volts every few cycles, say, once a week. This allows the BMS to balance out the charge in each cell if the cells in the pack are not exactly matched. Most BMS only balance the voltage at 4.2V. Hope that helps, and your choice of the Chinese platforms is a good one. I replaced my (four) Segway MiniPRO with two Airwheel S5, and have not had a single problem since then. I also bought a 2400W 'Halo Knight' in-line scooter, which is a real pleasure to ride!
  8. If you don't need the final 15% of battery longevity you can charge each cell to 4.0V only. That will reduce the self-discharge and increase battery life. Best to keep battery more than half-full, don't let it empty out as this reduces battery life.
  9. The Bluetooth on MiniPRO is strong enough to bring on headaches, affect balance, etc, which is why I modified the antennas on all four of my machines using the modifications I posted earlier in this thread. Apparently you can also cut the power to the bluetooth chip, I have not looked into doing that. The antenna mods are sufficient to take the level down to the Bioinitiative safety level.
  10. I used silver paste on my heatsinks. The failures were not due to hardware, but to software bugs (firmware bugs). As @WEagle95 told us, the interrupts re handled badly, there is no handler for bus error, and every so often it will just fail. Depending how heavy you are and the terrain you are driving it on. I have had no problems with my Airwheel S5 (touch wood). It is slower, but solid...
  11. @ABEhrhardt MiniPRO has no gears at all, and it cannot supply enough torque to safely handle all situations the MiniPRO finds itself in. Consequently many riders have been thrown and hurt. There are several discussions here on that topic. What caused me to give up on the MiniPRO was when it shut off while going down a steep hill, throwing me and badly dislocating my shoulder. The machine was definitely not being driven outside its parameters at the time, maybe a low battery was the problem? In any case it hurt me without warning, and so I have changed to using the Airwheel S5, which has worked really well (touch wood). I suspect the higher torque from the geared motor in the Airwheel S8 will give it enough margin to cope with any situation you place it in. Because of the extreme power and torque of my Airwheel S5+ (they are 1500W, designed for off-road with 19" wheels) I find that I no longer have to watch the road ahead for any obstacles under 2" or so, and this makes it really relaxing to ride... If I want to go faster I now have the folding electric bicycle (FIIDO D2).
  12. The miniPRO designers wrote a blog, which although in Chinese, translates well in Chrome or Google Translate. It is worth spending the time to read. The designers weight limit for the platform was 85Kg, and that was for the bigger battery pack. The higher limit came only from marketing folk. Take a look at the BLOG: http://bbs.ninebot.cn/forum.php?mod=viewthread&tid=4100&extra=page%3D1%26filter%3Dtypeid%26typeid%3D43 1/23 I weigh 90Kg, and have been thrown twice by the platform, which cuts off, apparently without cause. Both time my ligaments took months to recover (although my bones luckily remained intact). There is a thread talking about this design fault elsewhere on the forum.I don't use the miniPROs any more, I have 4 sitting in a corner of the garage...I now use the massive Airwheel S5+ (off-road) and a Fiido D2 electric bike when speed is preferred...
  13. While looking at eBikes I found that some are using the same sort of planetary gearbox internal to their wheel motors that the Airwheel S8 apparently uses. This overcomes the primary failure of the miniPRO, its inability to provide enough torque in emergency situations. eBikes which are fitted with these motors are rated to climb 30 degree slopes (eg Fiido D2) , while the standard motors are rated to 20 degrees.Yet the top speed does not seem to be affected much, it is obviously limited by law and battery power. issues. Here is a video showing how these motors work: And here is a diagram of the Airwheel R6 motor, showing its lower-ratio two-gear mechanism. This looks more like what they have in the drawing of their S8 motor:
  14. The S5+ I was sent has much bigger tyres, and, I think, a bigger motor, than the version they made in April 2019. The tires are now 130/70-12 Tubeless, which are the same as many scooters use. It does have a good off-road pattern: https://www.csttires.com/int/tire/cm502/ The outside tyre diameter is now just over 19" and they look nicely wide as well. Unfortunately it won't fit through our front-door like the earlier S5+ version. But the tyres look really business-like...
  15. @FreeRide, The only website who implied they had stock was https://flash-ecom.com Well, It turned out that they didn't have US stock, but they got the S5 to me in under a week, so I can't complain. To check that they were real I sent an email to the long.tan address on their webpage, and he sent me his phone number in China. I had previously bought Ebay stuff from long.jennie (apparently all part of the same marketing organization) so I was comfortable with dealing with them. I have been to Shenzhen half a dozen times, and have had no trouble with the businesses there... Well, the Flash website had discounted the $1600 down to $1420 (not sure why), but he asked for an extra $200 for air delivery, or told me he would have US stock in about 30 days by sea. Because I still thought the S5 had been discontinued I decided to pay for the airfreight, which was actually a good price for the 100lb item! It turned out that the handlebar stalk arrived by DHL in just 3 days, the heavier body by FedEx in 5 days (but the body had been through the 'flash' organization in Hawthorne/LosAngeles before being transhipped to FedEx). They said the body had to come via a slower freight service because the battery is 680Wh, over the 300Whour size limit for airfreight. So the body is marked manufacture date of 17th, and it was just delivered here on the 26th. Not bad... I am a happy camper... Now my wife and I each have an S5 and we need to get out and use them, rather than post here See ya! ps: Why did Airwheel send the handlebar stalk in a separate box?? The best suggestion I can come up with is that the lack of integrated handlebar might make the device look less like a Segway at Customs, and therefore be allowed through despite any possible patent violation issues... pps: The S5 weighs around 70lbs, but is easy to manhandle using the aluminum bars over the mudguards. The motor in each wheel is large and heavy, as are the 3.5" wide tires. The battery is 64 cells. Although the aluminum alloy body is strongly built, most of the weight is in the battery and wheels...
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