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  1. Selling lithium-ion sells

    Hello I am looking for interested individuals looking to build custom battery packs for electric vehicles or anyhting you want really. I have a rather large amount of nearly new Boston Power Sonata 5300 cells I am looking to sell at very cheap price. Feel free to contact me with any questions...
  2. 18650 cell cooling

    Batteries and Charging
    I am building a 18650 li-ion battery pack for my electric motorcycle. It has over 1000 cells and will hold over 9kWh of power. I am running the cells at a 1C discharge with peak discharge of 3C for no more than 30 sec. I am wondering if air cooling will be sufficient or if anyone has ever tried...
  3. USB powered 1A Li-Ion charger $1.99

    Batteries and Charging
    I just purchased one of these: I figured I can't go too far wrong at 2 bucks with free shipping. It uses the TP4056 IC which is a constant current voltage limited charger, resistor programmable from about 50 mA to 1A, and can be connected to a USB port or a...
  4. Lead's not dead: Design News article

    EV News
    I just found this article from Design News about an improvement in Lead-Acid cells for a much higher power density (not energy density), and longer life, at lower cost: There was also a recent article about Li-Ion cells used in...
  5. Testing a cheap Li-Ion 18650 cell

    Batteries and Charging
    I just finished a discharge test on one of the Li-Ion cells I bought on eBay at the price of $14/4 pieces including shipping. It is rated for 3600 mAh but my test as received showed only 530 mAh. Here's what I did: Now I need to charge it (while using the datalogger), and then another...
  6. GBS Battery Over-Discharge?

    Batteries and Charging
    Hi, I have a 10 kWh GBS pack which I left sitting on the garage floor for several months. During that time the, voltage has dropped to well below nominal - the pack is at 50V, down from 250V, I suspect that the cell BMS was draining the battery. I am concerned that the cells are damaged, and...
  7. Anybody use ModEngergy battieries??

    EV Performance Has anybody used these types of batteries "ModEnergy Li-Ion"