Lithium battery conversion accessory, 40V-100V, 120A dual parallel battery module, for simultaneous discharge of two batteries. This high-power version of the dual battery management module is for simultaneous discharge. Note: If the voltages of the two battery are inconsistent, the system prioritize the higher-voltage bank until the voltages are consistent and both are discharged simultaneously, with some operating current added. This depend on the maximum and minimum current protection limits of the controller, as well as the maximum and minimum voltage and current protection limits of the protection board. The system operate normally within these limits. Please select the appropriate controller for use. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: Black Material: Aluminum Alloy Package Contents: 1 * Double battery controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.