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fred_dot_u

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About fred_dot_u

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    florida
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  1. Not specific to this type of scooter, but I had a similar problem with a couple of Airwheel S8s. It's likely the batteries have dropped voltage to the point where the charger will not engage. I had to remove the battery pack (not a simple process with an S8) and charge the cells with an external balancing charger of the radio control type. It's necessary to unwrap the heat shrink in which your pack is probably enclosed. My pack has foam panels to absorb shock attached to the heat shrink, so I sliced carefully along one edge to enable me to re-wrap when the process was complete. If yo
  2. Being able to see the cell levels individually would be a great help for my Airwheel S8. When it finally left me walking, I pulled it apart and had 0.2 - 0.4 volt difference across the cells. If ninebot provides an app to show individual cell voltage, kudos to them!
  3. I've topped off the pack and they all reached nearly the same level. Not as uniform as I'd like, but all things considered, it's better than walking home. I don't have the confidence I once had, to make three trips totalling 10 miles, but I can still drive to my objectives and use the scooter to get around on the property. I also monitor it more closely, hoping to build back the confidence. I have considered to rebuild the pack with new cells and the original BMS, but I'd really expect the BMS was/is the problem, so researching has begun for a replacement. Everything seems to be coming fr
  4. Another clarification for which I thank you. I wasn't aware that the low end danger zone is 2.5v. That's much lower than I would have expected. I spent a good part of the day yesterday block charging the pack. I have an RC charger with balance and was able to bring a block of four cells right up to 4.20 v. The idea of doing this three more times was not attractive. I then realized I have a 12s charger and put it to good use. Today, the pack is reading 100% on the S8 app and got me through two grocery stores without incident. I won't be attempting to get to and from those stores until
  5. You can only be certain of the pack voltage when there is a load applied. A weak cell in the pack will drop sufficiently enough to trigger the low voltage and the built-in BMS is likely believing that it's fully charged. My Airwheel S8 has a pack with so many cells that were below acceptable levels that the system would not charge past 72% and my last trip turned into a walk home after three miles. I've dismantled the pack and have begun to individually charge the cells, hoping to get them to wake up. The long term plan is to replace the pack with fresh cells and use the BMS from the
  6. Thanks for the clarification. I appreciate insight from those more experienced. I've dismantled my pack today, as it left me stranded for the very first time. The partially discharged voltage levels for the cells are scattered from 3.66 to 3.99, pretty much all over the place. There's what appears to be a full pack BMS, as each set of cells is soldered to the main board. After a charge, terminated by the external charger, the voltages run from 3.81 to 4.21, mostly matching the disparities on the low end measurements. I don't know what current max is expected for this scooter, so
  7. As best as I can determine, the S8 battery is a 16s2p lithium ion pack, approximately 60volts. There's a watt-hour calculator that suggests the pack is 3.3 to 4.4 amp hour capacity based on a minimum voltage of 60 and a maximum of 60, more or less. The dimensions I've measured are 300 mm x 70 mm x 40 mm within a few mm. A quick check on the 'net shows a few 10 amp hour packs of similar dimensions and configuration. Is this higher figure a result of marketing exaggeration and/or more realistic calculations by Airwheel? I'm down to a max charge of 70 percent and that's rather fore
  8. I did the same, with a WalMart super sized gel seat, but if the OP has broken his in some manner, he needs a factory replacement. It's been quite a while since this forum has seen any S8 action.
  9. @Ron818, are you still looking for a seat for the S8? Do you mean the "standard" factory issue version? I've had to replace my S8 and now have too many spare parts, including the stock seat.
  10. I have a Focus Designs SBU, an electric unicycle with a seat. I think having a seat makes the learning curve a bit less steep. I've taught adults to ride in two fifteen minute sessions. I think it would handle the weight, although one would have to be careful at the edges of the performance and operating envelope. I was 185 when I rode it and 170 when I bought it. The extra 15 pounds cost me two miles range! At 230 pounds, you might have about eight miles range. Unfortunately, I'm asking US$750 for it, out of the OPs posted budget. I'm in Daytona, only an hour drive from Orlando
  11. The original post is three months old, but I'm hopeful the OP is still looking. I live in the same area and have a Focus Designs SBU not yet posted for sale. I was searching the listings to see how the SBU market is doing. Kennedy Moore, if you want a great ride, the SBU is one. Easy to learn (lessons included in the sale!) plus no shipping costs. I was planning to ask $750 for it, new was over $1700.
  12. Would you be suggesting that this particular scooter can have the tyres swapped out for the 90/65-6.5 versions? I've been pleasantly surprised at how well these tiny wheels handle obstacles that were unsettling when contacted with my Focus Designs SBU. I have my usual travels memorized for risky spots but occasionally catch one squarely and escape without even a missed heartbeat. If putting larger rubber on the rims means an even safer ride, sign me up! I apologize for the long delay. I don't think I have had my notification settings correct and am hopeful that they are now.
  13. The tire appears to be secured on a split rim, held together by what I thought were socket head screws holding on a wheel cover. After releasing the first one, I realized it passed through to the inside, holding the rims. A quick glance shows this to be true, along with a reasonably accessible tire valve. I used a valve extension to enable easier filling. The tires might have had about 20 psi (~1.4 bar) when I started, although some escaped during the attachment. The sidewall photo shows the tire size to be 10 x 2.50-6.5 with maximum pressure of 36 psi (2.4 bar), which is where I stopped filli
  14. There's more of a gap between sitting and standing on this device than there was on my SBU, as the seat post has limited travel. It makes things more jittery when transitioning, especially as there is nothing to clamp my thighs and/or knees onto as support while transitioning. I've managed a couple times to stand but not while traveling. A quick search shows minimal information regarding tire service, although I did find a Canadian online retailer which purports to sell S8 tires for nearly CA$40, rather pricey, but admittedly a niche product. When I unpacked the scooter, I noted no expose
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