These Flat Receiver Batteries are made using high-quality Tenergy Premium NiMH 2500mAh cells, and are available in either 4-cell 4.8 volt or 5-cell 6.0 volt configurations.  The cells are spot-welded together to ensure maximum performance and long life.  These batteries are just like the battery packs used by modelers for many, many years to power receivers and servos, and are rugged and dependable.
 
The packs have 12 inch 22AWG power leads, and are covered with heat-shrink to insulate and protect them.
 
2500mAH cells should be recharged at a charge rate of 300 to 500mA using a good qulaity charger designed for NiMh packs.