Brand Feature: Supports multi-layer overlay to increase power and capacitance. Supports subsequent expansion modules, supports single-sided or double-sided battery. High current wiring, full-chip high-current design for protection board and battery holder. High conversion efficiency, supports multi-layer balanced discharge. Includes over-voltage protection function to prevent overcharge or over-discharge. Includes voltage equalization function to ensure multiple battery sets maintain the same voltage, extending battery pack life. The protection board provides balance equalization for the entire multi-layer battery setup, eliminating the need for individual protection boards on each layer. Easy and simple to use and operate; no additional tools required for installation. Installation: Install the battery according to the positive and negative markings on the circuit board. Be careful not to reverse the polarity.Specifications: Item Type: Battery Holder for Protection Board Material: Plastic + Metal + Electronic Components Size: 151x85mm / 5.9x3.3in Color: As shown Optional Type: 1: Single-sided battery holder 2: Double-sided battery holder 3: Single-sided battery holder with protection board Voltage: 24V Current: 40A Quantity: 1 PieceWarm Tips: A 25.2V charger is required for 6S charging. It is recommended that the charging current per layer does not exceed 2A, otherwise the battery may overheat (e.g., use a 2A charger for one layer, 4A charger for two layers). Do not place on metal surfaces during use; ensure proper insulation to avoid short circuits. Battery must be placed facing up on the circuit board; all batteries must face the same directiondo not interleave. Do not connect to incorrect power supply; observe the markings on the circuit board carefully. Note: Battery not included. Conversion: 1cm = 10mm = 0.39inch Please allow 01cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you.Package Includes: 1 Set x Battery Holder for Protection Board Kit (Does not include the balance line shown in the picture)