CL-18650-29E/3S1P / Backup battery 10,95V Quick view Add to compare Price €89.00 Li-Ion, 1850 mAh battery. For installation in VT825 and VT825DC monitoring units. Used as a reserve power source. Connects to the "DC 12V Backup power" port. Requires "VT101 / Battery holder" and "VT18 / Extension board".