Thanks, again ! Am just reading the airdata … battery was built in 2015, has 98% remaining life, 4285 mAh initial charge, 8 times charged. Highest drops in voltage where in the first 100 feet of ascent, no major deviations between cells (max. 0.007 V, twice, cell 1 and 4 once each), decided to auto land at 3.845 average volts, 15328 total volts, temperature 105 degrees, max cell deviation 0.004V and remaining power 68%. With that flight pattern the battery would fly me 22:46 Minutes, flew 11:54. So no clue as to battery malfunctions, she is reinstated. Thanks for the hint, love this airdata thingy, mystery remains. BTW at 4531.8 feet 78% signal, during landing signal dropped to 44% at 4206 feet and 0% at 2342 feet. Why the hell signal drops while drone approaching ? Weather was actually optimal, as of airdata, 3.4 MPH max wind, temp. 70.1, humidity 54%. BTW no. 2: No aircraft but mine showed on my radar within 10 miles range and up to 10000 feet.