DIY 4S 21700 Lithium Battery Pack 14.8V/16V 60A 120A 21700 Battery Box Battery Pack 4 Series Solderless Battery Box 16V Battery Pack Protection Board 21700 Solderless Manufacturing Uninterruptible Power Supply/Backup Power Supply/multilayer Power Wall

4S21700 welding free design. 16.8V 60A120A maximum output. High temperature resistant battery box. Comes with insurance. Double sided battery. Multiple BMS balance options available. High temperature resistance, excellent structure, helpful for heat dissipation during battery use. The battery box comes with a built-in fuse for safe use. Choose to use a double-sided battery box independently, effectively reducing volume and increasing capacity. Multiple protection boards to choose from, with powerful functions to reduce worries and ensure consistent flushing and placement. Welding free design, simple and fast assembly, only requires batteries, no welding required