The screen is upside down because your ruler is in caliper mode. Please select the Ruler Mode in the setting

The battery capacity is a rechargeable Li-on 1000 mAh battery. It can be used for about 1-2 weeks on a single charge. Like most electronic devices, the battery is designed to retain an estimated 80% of its original capacity at 500-800 complete charge cycles and is not replaceable.

Drawing Mode: export files in dxf(2D) .dxf(3D) , Also export scale drawing in pdf. jpg. formats(auto-scale fit to A3(Metrics) / Tabloid(Imperial) size paper) List Mode: export files in excel sheet(.xls), txt.