Banggood "Dear customer,  Thank you for your order and before even attempting to explain the reasons leading to this unintended mistake, we would like to sincerely apologize to you. In our attempt to serve you better and retain you as one of our valuable customers, please contact our customer service representatives by this link:http://www.banggood.com/Contact-Us_hi111 .  We would highly appreciate if you could send us all the information listed here below:  1.Some photos of the shipping label, which can be found on the external side of the package; 2.The SKU number of the products you received. You can find this information on the label placed on the item itself; 3.Some photos or video to show the entity of the problem; 4.The order number and the product ID. Looking for your kindly reply. Have a nice day."

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felix You have to check your batteries first. The cells have to have about the same voltage. This board connects the cells of each battery directly with each other. If the voltage difference is to high, a high current will flow and the board will burn.There should be a warning label though.

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