Hey ino its not cheap but we have been putting these battery's in a few aircraft and every one loves one you can buy them for 515 at aircraft spruce Brantford heres a link https://www.aircraftspruce.ca/catalog/pnpages/11-13907.php?gclid=EAIaIQobChMIsfXO_cvC8AIVjPbjBx0PGgi7EAQYASABEgJVM_D_BwE