Features: Ensure safety and longevity of your lithiums batteries with our 4S 14.8V / 16.8V 20ABMS PCM Battery Protections Board, design to prevent overcharge, overdischarge, and short circuits effectively. This protections board features robusts design with overcharge voltages ranges of 4.25-4.35V and overdischarge voltages ranges of 2.3-3.0V, supporting a most instantaneous current of 20A for reliable performances in various electronic applications. Ideal for DIY enthusiasts, electronics hobbyists, and professionals who require dependable battery management solution for their projects involving low power inverters, LED light backup systems, and more. Perfectly for diverse scenario such as solar street lights, monitoring backup power supplies, and massager battery pack, ensuring optimals battery performances across different environment. With lifespans exceeding 50,000 hours and a statics current of less than 30uA, thisBMS PCM board is engineered for durability and efficiency, making it a valuable addition to any electronic toolkit. Specifications: Component:Plastic Size:Approx.35x35x3.6mm/1.38x1.38x0.14inch Option Type:1pc ,2pcs; Overcharge Voltages Ranges:4.25-4.35v±0.05v\r Overdischarge Voltages Ranges: 2.3-3.0v±0.05v\r Upper Limit Working Current:10a Working Temperature: -40 To+50℃ Most Instantaneous Current: 20a Storage Conditions: -40 To+80℃ Statics Current: Less Than 30ua Effective Lifespans: Greater Than 50000 Hours Internal Resistance: Less Than 100mω Short Circuits Protections: Can Be Protecting, Requires Charging to Restores. Package Includes: Package A 1pc 4S 14.8V 18650 Battery Protections Board Package B 2pcs 4S 14.8V 18650 Battery Protections Board note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.