UPS PLATE Model: NANOL2S-C Input:10-16.8V, Nano Battery*2 Output:10-16.8V; 3-Dtap Output:10-16.8V Working current:8A(Max)1.UPS Plate, automatically power switch between A and B battery, able to get unin -terrupted power supply by A and B batte -ry. Please use two full power batteries, battery A works first. 2. During in work, when A battery empty or remove A battery, power will automati -cally switch to B battery, indicator on. 3.Hang up the fully charged battery A, au -tomatically switch back to the battery A discharge, battery B working indicator light off.