Example Uses: 1. This balance module can be used in parallel with a BMS to boost the balance efficiency of battery/BMS setup. 2. Secondly, the balance module can be used without a BMS, and will keep the individual battery cells within healthy balance levels. 3. Lastly, this balance module can be used in place of a traditional BMS. In specific setups where a battery is connected stable voltage source such as a 16.8v charger or solar charge controller (16.8v) and the output is controlled by a low voltage cutoff such as a inverter. We offer professional design consultation and services. Please let us know about your project!Purchase price of item will be credited a full 100% towards consultation information and services. Billed @$65 per hour, in 15min increments. Description: This standalone balance equalization board is used for a 4S lithium battery pack without a balance feature. This standalone module does not charge or act as a low voltage/over charge cutoff. This board uses a resistor to balance each cell to 4.15v/4.2v. This board can also be added to an existing BMS battery setup to boost the effectiveness of the balancing function by increasing maximum balancing capacity. Battery compatibility: Voltage of 2.5V - 4.2V lithium battery (18650, 26650, LiPo, Li-ion) Battery voltage range: 12v - 16.8v Maximum balance current: 66mA Board Size: approx. 37.3*25.8*2.4mm Package includes: 1 x 4S Lithium Battery Balance Board Wiring Instructions: B- is connected to the negative terminal of the battery 1(-) B1 connects between battery 1(+) and battery 2(-) B2 connects between battery 2(+) and battery 3(-) B3 connects between battery 3(+) and battery 4(-) B4 is connected to the positive terminal of battery 4(+) Shipping Note: Single boards may be shipped via USPS First Class Large Letter locally from the Cleveland area, a tracking number may not be available. Orders of two (2) or more will be shipped as a First Class Package including a tracking number.