Several months ago I bought a pair of 6.6 volt (two cell) 1800 mah Lithium Ferrite Posphate (LifFe) packs. I fully charged them then put them away thinking that I would use them as replacements for two of my planes. I posted a picture of the "servo tray" area of my Skylark 70 in this posting:

http://www.rcuniverse.com/forum/m_9699431/tm.htm

It clearly shows my LiFe pack.

Well, as I said, I bought this pack, one of two, several months ago and fully charged them at that time. Well, just before I put the pack in my Skylark 70 this afternoon, I put it on the charger. It took about 5 minutes for the charger to do it's thing and it "reported" fully charged.

My point here is that these batteries do in fact hold their charge and are well suited for use on our sport aircraft, using receivers and servos that can work with 6 volt packs.

BUT, and there is always a but, isn't there? Butttt.. the issue with these batteries is that they do require a charger that can deal with LiFe packs. So, before you decide to buy them, make sure you have a charger that is capable of charging LiFe packs or are prepared to buy a charger that will charge LiFe packs. I did the latter.. I bought the Electrifly Triton 2 EQ that can handle charging pretty much all of the batteries that I use, including LiPo and Lead Acid.

CGr.