Thanks for your prompt help and advice Timbo. Previously I was having 10 minute flights on my 4.8v 1100mAh pack on 35 mHz, unfortunately I can't remember exactly how many flights I used to have but it was probably five or six before a recharge was necessary. The 6v pack I can get is of 1700mAh capacity, so presumably if I kept to the same flight duration I'd expect my onboard voltmeter lights to show orange after fewer flights? Seems logical. Oh yes, I remember now being told the 6v pack in question consists of NiCd cells but not sure if that makes a difference to this situation. It occurs to me from what I understand you to say, it would seem there is an alternative to the one you suggest and that is if I stick with the existing servos I should use the 4.8v pack? It would seem to be 'second best' but nevertheless, presumably, viable? Unless, of course, that in turn, raises the confusing (to me anyway) combination of other variables eg, type of plane, style of flying etc and the resulting load on the battery and the subsequent possibility of dipping below the threshold of the Rx lower voltage supply limit? Hmmm, seems to my simple mind that using 6v would do away with all that uncertainty!!!!!!!