Boosters only usually get fried if wired wrong,or maybe a power hungry servo(savox).
I used an SMC lipo rx pack on a 2 cell only esc,was and still is for sale here on oople .This can also be used on plenty of other things,my dads rc sailing boats for example.
£50 will get you a brand new Core esc though,and £100 for the esc,motor,prog card combo.
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