This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps. Small compact design for small electric motor airplanes. The S3153 servo cannot be used with gasoline engine airplanes and with large gliders and other models that require a lot of torque. Using with a large load at a higher voltage will shorten servo life (4.8V recommended).