Hi LT-40,

JR 700 is a good receiver, I have this receiver somehow it stopped working after my P51 Mustang PTS crashed. The Tx/Radio of JR is 5 channel XF421 EX, the battery is pack for the receiver has 4 cells pack and is 4.8volts, and its 600 mah/milliampere per hour. its Nicd=Nickel Cadmium, was first introduced in 70's in sweden, due to weight it was replaced by Nimh=Nickel metal hydride which was introduced in I think 90's anyway, more have been introduced like Li-ion, lithium ion, lithium ion polymer but these are used for cell fones, laptops etc. Ni-mh is more powerful than Ni-cd, and it doesnt store memory, well, all battery cells rechargeable have same 1.2 volts and total make 9.6 volt for Tx, and 4.8 for Rx. In order to increase your flight time, you can use Higher Mah battery pack cells, like 1500 mah or even 2600 mah. As I had the battery problem of my Tx, I got Nicd battery pack of 700mah, honestly speaking, Ni-mh was doubled of its price so I bought Ni-cd, anyway, its working very well, and Im sure my radio would easily give me 7 to 9 flights. Anyway hope for the best for you.

Mody