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  1. M

    Homemade Battery Build 48V 20Ah Finished

    Just posting some pics of a homemade 48V 20Ah ebike battery pack. The 18650s aren't the best because they are 1C but they were new and got them fairly cheap. I made sure all parallel units had the same number of the different types of 18650s so that all of the parallel units were a close match...
  2. M

    Which design balances cell stress the best?

    Basics: Below are four designs for connecting a 10P 13S 18650 pack that will have a 25 amp limit. All the cell to cell connections will be made with .15mm x 8mm Ni Plated Steel. The 5 lead wires (16 - 20 awg) merging into one (10 - 12 awg wire) will be all the same length. Questions: -Which of...
  3. M

    18650 Cell Connections for ebike Triangle Battery Pack?

    I'm attempting to construct a 11P13S triangle battery pack (w/ BMS) out of 18650 Li-ion laptop cells. This will be connected to a 48V 750W BBS02 (25A current limit). In the diagram above: -Each number is an 11P unit that will be spot welded together with 8mm X 0.15mm Pure Ni Plate Nickel Strip...
  4. M

    Adding a parallel battery to eBike

    I already have a 48 V 20 Ah homemade (18650 Li-ion) battery hooked up to my BBS02. Is it possible to connect another 48 V 20 Ah battery in parallel? Would this also help with the voltage sag on my current battery?
  5. M

    BBS02 Motor Cutoff Switch Failure

    I have recently installed the BBS02. I took apart the original brake switches for the motor cutoff so that I could install them the same way you would a hall or reed switch. When I was testing if this would work, bringing the magnet close to the chip (I believe it is a Field Effect Transistor)...
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