I have no idea
everyone asks me and i assumed it was the throttle control my Tx gave me, now thats been sorted i still seem to go through them at an alarming rate, its scary. Btw i can manage a night on one set of rears, it it does take them down to practice tires.
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Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip
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AX-10 Crawler - Thats all I have left!!!