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  1. H

    Buying batteries from aliexpress and alibaba

    There are something strange in aliexpress and alibaba. For example this product page: http://www.aliexpress.com/item/18650-US18650VTC5-3-7V-2600mAh-high-drain-30A-discharge-vtc5-battery-for-Sony-power-tool-makita/1872913567.html In title is written: "for Sony" What word for does mean? In...
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    Question about mac 12T torque

    Now i have crystalyte HS2440 and 25 amperes controller. According simulator it gives at 37.5 v (12s lifepo4 at load) 51 N/m torque on start. With 26" wheel at 13 km/h it's cofficiency is only 43.6%. If i choose BMC v2 speed then it gives 73 N/m torque at start, and at 13 km/h efficiency is...
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    Cheap lifepo4 batteries on ebay

    One or 2 month ago on ebay appeared new lifepo4 seller. He sells batteries at low prices, has 100% positive feedback. Does anyone know anything about these batteries? http://cgi.ebay.com/36V-15AH-LiFePO4-Battery-Rechargeable-Charger-BMS-Power-/140578098640?pt=US_Batteries&hash=item20bb1b8dd0
  4. H

    Question about nimh batteries on ebay

    http://cgi.ebay.com/6-x-C-Size-9500mAh-NiMH-Rechargeable-Battery-Ultracell-/270751582587?pt=US_Batteries&hash=item3f0a0d497b Energy density 190 wh/kg. Price 245 dollars per kw/h only. It is true? Seller has 99.4% Positive feedback. Wikipedia says that nimh's maximum energy density is 100 W·h/kg...
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