hi Timbo and Eric thanks for the replies, i have just checked they are ni-cads in both. i have been using my tranny with a sim on my computer and have used that till it runs down, that gets used quite regular every couple of days and takes about 14 hours of use before flattening.The reciever pack is also new and has only just been charged for the first time to install in model and reset/centralize servos.i was just concerned about that memory effect and not getting a full usable power out of them both. many thanks guys, happy flying and make the most of the weather