How to Connect BMS for 3.7V, 7.4V, 12.4V, 16V, and 24V Battery
Using step-by-step animations, this tutorial guides you through the exact wiring method for each type of pack, ensuring safety, accuracy, and functionality in your DIY battery builds.
Connecting the BMS: B- Terminal: Connect to the main negative (-) terminal of the battery pack. B+ Terminal: Often already connected internally; check your BMS specifications. B1 (or B0): Connect to the most negative point (first cell's negative terminal). B2, B3,: Connect sequentially to the positive terminals of each cell in series.
Daisy chain the battery control cables between the lithium batteries and connect the ends to the BMS port. To extend the communication cables between a Lithium Battery Smart and the BMS, use the M8 circular connector Male/Female 3 pole cable extensions.
Always consult your BMS manual, as configurations may vary slightly depending on the model. Before you start, ensure you have the following: BMS Board: Choose a BMS rated for your battery's voltage and current (e.g., 4S for a 14.8V pack). Battery Pack: Lithium-ion cells (e.g., 18650) arranged in series (S) or parallel (P).
A BMS makes a lithium-ion battery safer by preventing the cells from ending up in situations that cause them to rapidly increase in temperature. A BMS also protects the health of your battery cells and extends the overall life of your battery by making sure the cells don't get over-discharged. Attaching a BMS to a battery is fairly straightforward.
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