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Apex S3 Horizontal DIY 51.2V Battery Box Kit for 16 LiFePO4 Cells Short answer: This USA-stock Apex S3 kit is a horizontal, stackable enclosure for building a 16S 51.2V LiFePO4 battery. It includes the metal case with a preinstalled JK PB2A16S20P V19 200A BMS, 2A active balancing, 4.3-inch touchscr..