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  1. J

    Chinese 84V (72V/20S) Chargers from Ebay -- thoughts, experiences

    As my EV-converted Vespa will have 70AH (72V/20S) of battery capacity, I'd like to get a higher-current charger (currently have a 4A and an 8A, which I've used in parallel for 12A). I'm looking at this 15A model: https://www.ebay.com/itm/234812216422 and this 25A model...
  2. J

    Tool for making slots in nickel or copper strip

    What tool are you all using for cutting slots for welding? I'd think some sort of punch tool that cuts a 10mm X .5mm slot would be ideal. Google hasn't been much help finding one. Thanks all!
  3. J

    Daly BMS Problem (150A/72V 20S)

    I have a Daly 150A/20S BMS on my EV converted Vespa "VespaLectric". The last time I tried to ride it, I switched on the main switch, tried to go, and lost all power. Long story short, looking at the bluetooth app, it appears that the charge and discharge FETs are both shutting off like there...
  4. J

    Honeycomb 21700 Cell Holders -- looking for source

    I'm looking for a source for honeycomb-style 21700 cell holders for my next build. I want the honeycomb-style so that I can get more cells into the same space. They seem to be commonly available for 18650 cells.
  5. J

    Tool to punch slots in nickel (or other metal) strip for welding

    Is there a tool available that can punch out slots in nickel or other strip to facility better welding? I've been able to found pre-cut ladder-type strip that has pre-cut slots in it. I'd like to use a wide solid piece of 0.2mm nickel for a 21700 pack that I'm building. I know that with...
  6. J

    Nickel Strip -- looking for reliable source

    I just ordered 160 high-current 21700 cells (Samsung 40T) to build a battery for my electric-converted Vespa. It already has one 20s8p battery built with the same cells, I'm building a second one for additional range, and to reduce heating of the battery during sustained high-power usage...
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