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...

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...

I just purchased one of these: http://www.ebay.com/itm/190898629075 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...

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: http://www.designnews.com/author.asp?section_id=1366&doc_id=250256 There was also a recent article about Li-Ion cells used in...

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...

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...

http://www.modenergy.com/index.html Has anybody used these types of batteries "ModEnergy Li-Ion"