Stemme S12 Strong Thermal

August 7 2020 I encounter the strongest, roughest thermal that I've ever been in with my Stemme S12. Unfortunately, the audio cable came unplugged AND the VIRB battery died before I landed in this two hour soaring flight. Look at the 48 minute mark for the strong thermal. I've deleted many of the cruise portions of the flight. I flew about 40 miles toward Indianapolis Regional airport, then flew back, all gliding and landed as a glider.