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  1. bobale

    Disaster waiting to happen in Zippy battery

    In the pictures below you can see casing and one cell from Zippy Flightmax 5000mAh 20C battery: I don't know whether it can be seen clearly from the pictures above, but the casing is not processed properly after molding, so the protruding thingy left is pretty sharp, and it looks like it...
  2. bobale

    How to identify 4130 CrMo bicycle frame?

    I'm looking for a steel frame for my e-bike, and found one which is very cheap, and it says 4130 Chromoly on it. Seller, of course, claims it is CrMo. Is there any simple way of checking whether it really is 4130 steel, or it's just made out of cheap, ordinary steel?
  3. bobale

    Anybody have any idea which motor is this?

    I'm interested in buying second hand motor in attached picture, but the seller is clueless on any specs about it. It looks kinda like the MXUS geared cellman sells, but not entirely. Only specs I've been given is that it will max out at 20mph on SLAs supplied with it (seller says 4 of them, so...
  4. bobale

    Will stock 9C 2807 like being powered by 72V 40A controller?

    I currently have completely stock 9C 2807, with stock 22A controller. After only a month I've decided that's not enough :mrgreen:. I'm considering upping the voltage (20-22S LiPo) while using HuaTong 72V 40A controller, so I'm concerned about cruising capabilities of 9C. I know I can't dump...
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