mobilev is the seller on ebay. I do not know how to modify it other than grinding out the battery bay for a fit. This should have a removable battery bay for the lipo. The lipo's are only $8 for 8 volts, that last forever. I have heard of radios going a month on these in the DX3R. I have also gone back to the SR2000 rx now that I am using these batteries, and no problems, very nice. I don't know why, but the rx's seemed to have to adjust to the stronger signal, due to the higher voltage, weird, or it just seemed to act that way, don't know for sure.