Hello. I have been looking at some Li-Ion batteries is search of a replacement for my aged TX. Lets say that size does not matter (no pun) (no really no pun) and you can use the largest Li-ion battery, for example here are some batteries: http://www.batteryspace.com/index.asp?PageAction=VIEWCATS&Category=1338 and if I would like to use this one: http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=4241 Its a 5000mAh 3.7 Li-Ion, so technically the task is to solder the charge controller of my old TX battery over this one for it to work? If there are other considerations, if this wont work please comment about it. Thanks for your input. Konstantin.