Features: *Lithium Battery Protection Circuit Board Module 1S 2S 10A, 3S 4S 5S 25A Charger: This protection board features a mature protection circuit with high current and ultra-low internal resistance. The single internal resistance can be as low as 3 milliohms, ensuring complete and stable charging and discharging protection functions. It is designed for power type high current lithium batteries, making it suitable for high current applications such as power tools and aircraft models. *Precautions1: B- and C- lines should be connected with thick wires and ensure correct welding to the positive and negative poles of corresponding equipment. *Precautions2: Proper battery matching is required before installing the protection board. Each battery should have a voltage difference no higher than 0.05V, an internal resistance difference no more than 5m, and a capacity difference less than 30mAh. The protection board safeguards each battery string, triggering protection if any string has excessively high or low voltage. Better battery consistency leads to longer overall battery power and improved performance of the protection board. *Precautions3: Single batteries must be connected in parallel to form the required number of battery packs, which are then used in series. *Precautions4: When connecting 3 groups of batteries in series, it is important to ensure that the voltage of each group is the same. If not, charge each group separately before connecting them in series. During discharge testing, the battery group with the fastest voltage drop indicates poor battery performance. Specifications: *Part Name:Battery Protection Circuit Board *Material:Plastic *Size:60*20*10 mm *Color:Red Package Content: 1 * Battery Protection Circuit Board Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Lithium Battery Protection Circuit Board Module 1S 2S 10A, 3S 4S 5S 25A Charger Made of standard material, quality assurance and practicality. Perfect function, bring you a wonderful experience. Every customer is entitled to a 30-day refund or replacement for damage/quality issues. If you have any questions, please feel free to contact us and we will solve it for you.