LiFe, Lithium Ferrous Phosphate, battery packs have the advantage of being Lithium based so they have similar advantages that LiPo batteries do, two cells = 6.6 volts (nominal) so you can use them on our receivers (that are able to work with 6 volts), have a good discharge rate, and are light weight.

Disadvantages are that they require a specific type of charger similar to the Triton II EQ.

As I said in my original post, I just installed one in my Skylark 70. I went from 1200 mah NiMh to 1800 mah LiFe and the pack is lighter than the older, lower capacity battery pack.

CGr.