Cirrus SF50 pilot reported encountering severe turbulence in cruise flight that resulted in loss of 800 feet of altitude.

Narrative

During cruise flight at 26;000 feet in an SF 50 aircraft; we were cleared to ZZZ with left and right deviations as necessary. There was a line of thunderstorms ahead; and we had live weather radar; GPS NEXRAD; and visual observations of vertical developments. The radar showed a gap approximately 10 to 15 miles wide with light precipitation. I reduced the power setting and navigated through the gap indicated on the radar in heading mode.ATC alerted us to moderate precipitation at 12 o'clock; one mile ahead. Soon after; we encountered severe turbulence. I immediately reduced the airspeed to below maneuvering speed. Despite this; we experienced a loss of altitude of up to 800 feet; moderate precipitation; and moderate mixed ice. The severe turbulence lasted for approximately 15-20 seconds. There was no structural damage or injuries to passengers.I believe this encounter resulted from potential over-scanning of a cell and not maintaining conservative enough minimums to avoid the weather. I notified ATC of the altitude deviation; and we quickly recovered. The rest of the flight was uneventful.