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  1. S

    5S LiFePO4, 12v, no BMS

    The conventional wisdom for managing a 4s 12v LiFePO4 battery using BMS for longevity and safety. Now that costs and availability have significantly improved, there may be an alternative method. What if an addition cell is added to create a 5s, but still is only charged to 4s voltage, 14.6v...
  2. S

    replacement bearings for Sondors thin

    Found the bearing number, it was cast into the bearing seal, 6003 RS. I edited the image to make the code more visible. These are cheap $2 Chinese bearings. I went and splurged on higher quality Japanese bearings to replace them.
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    replacement bearings for Sondors thin

    I have an original Sondors thin I ride every day and the bike is mechanically starting to wear out, I've roughly 30,000km and move a lot of cargo in an urban setting with a trailer. I replaced the motor transmission 6 months ago and now the motor bearings showing extra play from wear, the wheel...
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    Motorizing a Bicycle Trailer

    I use a trailer a lot around town and sometimes I transport a heavy load, usually like 50lbs or more, and it's a real drag. So I would like to look into a motorized trailer. I at the beginning of this investigation, so I haven't settled on anything yet. The features I know I would like to have...
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    Bonafide Chinese NCR18650b, an oximoron?

    Hi, I'm evaluating building a couple of 13s9p pack and trying to find a supplier for about 250units. An Alibaba search yields with very promising results. However, I am uncertain of the authenticity from these suppliers. Thanks for any input. Kris
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