But first, just exactly how can a turboprop be battery powered?
Maybe king air b200?
2* PT6A-52 @850SHP, say 630KW per side, 1260kw total, cruise at 75% but say ~900KW average for taxi, take off, climb, cruise and descent - short flights inherent.
Mission - country centres, 1 hr flying.
Assume fuel rules include:
Taxi fuel,
Flight fuel,
Alternate fuel,
Variable reserve,
Statutory reserve.
Very roughly - 2 hrs energy at start, round to 2,000kwhr.
Tesla S 85kwhr battery weighs 540kg so Flight battery weight ~ 12,000kg (2000/85*540)