Summary When you need capacity above all else the 340ELR is your battery of choice. Using REPT 345 cells that test well into the mid 350AH, the 340ELR sets the bar for most capacity in its class. Featuring our latest network card that adds support for Zigbee & Thread, Bluetooth 5, and a FCC certified ESP32 MCU, the 340ELR includes all the SFK enhancements such as Enhanced Victron communications, triple heating modes (low temp, standby, or Venus OS/Victron controlled) with new hardware I/O with a waterproof usb-c port and more app features than any of the SFK batteries preceding it.