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  1. jasontaylor

    Charged car battery to 15V. What H2SO4/H2O ratio to refill?

    Being an idiot, I failed to verify that my chinese charger wasn't going overcharge my 12v car battery. Worse, I let it sit in float mode for a week. Well, the picture here shows why I'm here...
  2. jasontaylor

    Why are LiFePO4 costs still high?

    There should be an economies of scale relation, such that costs go down when sales go up. But LiFePO4 costs the same now as many years ago. Does anyone know why the costs are not coming down? SLA are extremely heavy, and lead is expensive, so I would assume SLAs should eventually cost more...
  3. jasontaylor

    Looking for 15-40 kV hub motor with diameter <=9inches

    The mini hubs on ebay are 10kV=10 RPM / Volt, so max RPM (zero torque, coasting in space, you do drive there, no?) @ 48 volts is only 480 hz or so. Does anyone know of a hub motor that is small and has higher kV? Outrunners have kV >> 100 and obviously they aren't hub motors. I don't...
  4. jasontaylor

    Is there a programmable charger out there?

    Hi. I am looking for a programmable charger. I know there are usb ports on some of these lipo chargers. I know they have firmwares, since you can upgrade them. So they are full computers. Very flexible. That is how they can do fancy things like turn off, look at negative peaks, balance...
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