4s3p Battery Spacer A123

thingiverse

This is a spacer for a 4s3p Battery Pack. The pack is used as battery for my Buell XB12. It can be used on any motorcycle but you have to check if the on board voltage doesn't exceed 14,4 Volts at any time. I used Lithium Werks (formerly A123) ANR26650M1-B cells because of their very high pulse current capability and their robustness. Those are LiFePO4 cells and therefore not as volatile as LiPO cells. They don't explode as easily and can survive over voltage for short periods of time without dying or going up in flames. Most commercial LiFePO4 packs use those cells as well. A 4s3p pack of ANR26650M1-B cells results in: + Voltage: **13.2V (nominal)** + Capacity: **7.5Ah** + Current: **150A** + Peak Current (<10s): **360A** This should be enough to start a big V2. If you have a smaller engine a 4s2p could be enough. I also connected a balancing connector. Balancing shouldn't be necessary but with a connector you can at least check if the cells are still in good shape. ** If you don't feel comfortable handling a soldering iron or are not used to handle electronics I wouldn't recommend building a pack on your own. You won't save much money compared to a commercial pack and you can easily destroy the cells or hurt yourself while soldering or if you accidentally cause a short.** Tested with an electronic load at work. 170A ist the limit of the load and voltage measured directly at the pack was still over 11V after 10s (voltage in the picture is at the terminals of the load, with very long cables and 3 connectors in between). Temperature inside the pack did rise to about 40°C. So looks like a success to me. Test in the motorcycle will follow in spring.