Using NiMH RX 2500 mAh Batteries will greatly increase your flight time and not add any additional weight. Charge once and fly all day and maybe even two days. Using a 6V battery will give your servos more power and again last much longer than 4.8V Ni Cad batteries for about the same price.
Normal Voltage: 4.8V
Normal Capacity: 2500mAh
Dimension: Measure 56 x 50 x 14 mm
Weight : 4 oz per pack
4 AA 2500 mAh Ni-MH matched cells
Hitec/Futaba standard connector
High temperature PVC wrapper
For Airplanes and Gliders of Hitec, Futaba
Standard in compliance with ISO-9002, quality guaranteed
Long cycle life: can be recharged up to 1,000 times
Environmental friendly, Ni-MH contains no toxic waste
High loyal capacity, long running time
Meeting stringent quality standard
No memory effect