12V Motorcycle starter battery, 8S Lithium 26650 cell, hard case

thingiverse

I use this case with 8 x A123-ANR26650m1b cell, according to specification attached below. The cranking power reaches 240A and maximum charging is set at 20A up to 14.6V in 4s2p configuration. A123 recommends a charging voltage of 3.6V per cell; however, if you have prolonged periods of constant charging, it's recommended to lower the voltage slightly but still maintain its effectiveness. I've been monitoring my battery for three years by measuring voltage and temperature. If you're using your motorcycle continuously for 24 hours a day, you should also monitor the heat generated. Similar information can be found at http://liionbms.com/pdf/a123/charging.pdf. The voltage regulator on my bike is set to 14.4V. For maintenance balancing of cells once a year, use a 4S balance cable. I personally use the Imax B6 charger and there's a flat cable opening in the case for this purpose. Make sure to glue the battery case together securely and ensure that cables and cells are safely enclosed within it. The weight of my standard led battery is about 750g, which is significantly less than the Duke 390's 3.36 Kg. The dimensions are L = 111, W = 57mm, H = 83mm. When using high-load cable and connector from this battery, I recommend using the XT90 connector rated for a continuous load of 90A. However, I later removed it and used rings to connect directly to the default bolts. **WARNING!!** - Be aware that working with lithium batteries requires soldering skills and knowledge about their dangers. If you're not familiar with these concepts, be willing to learn through online resources such as YouTube or forums. The LiFePo4 is considered one of the safest lithium cells on the market and fits perfectly in a motorcycle setup. If your bike often starts in extremely cold weather, it's recommended to turn on the headlight for 1-2 minutes before starting the engine to warm up the cells. If daily starts around zero C lead to degradation, consider using an led battery type instead. **UPDATE:** I have created additional versions of this case, including a 4S version (https://www.thingiverse.com/thing:3461006), a 16S version (https://www.thingiverse.com/thing:3707791), and a 12S version (https://www.thingiverse.com/thing:3714356). **PRINT SETTINGS:** When printing items that are usable, I usually make them slightly stronger by setting at least four perimeters in top, bottom, and sides, with 10% infill and a full honeycomb pattern. Additionally, using a bit warmer nozzle, more plastic flow, and slower speed can also be beneficial as it makes the part stronger but less visually appealing.