We use Sanyo cells for all of our battery replacements. Special manufacturing fixtures allow us to build packs to fit most transmitters as well as special rx packs. Call for prices. 1.5 Khz from center frequency. Frequency changes are common in order to obtain a frequency that is less crowded or to move away from known interference at a local flying field.
Costs vary from system to system, due to the price of xtals required for the change.
Most newer systems use dual conversion xtals in the receivers. Labor is charged in 15 minute blocks. System repair minus servos will be charged 1 hour labor. Extra items in a repair such as servos or receivers will be charged at a reduced rate. All parts costs as well as shipping are extra.