Bought a used I1 with 3 TB 47's. Bought a TB 48, all the 47's have about mid 60's cycles on them. All of them are down to about 8 minutes of flight time. I never really measured flight time upon first flights. Had the bird about 5 months, but has anyone experienced the 47's going down with this number of cycles?? Haven't done any voltage readings yet under load. What should they be?? Thx Bolton