... use good audio capacitors: Nichicon MUSE MP,Nichicon SILMIC,Panasonic FM,ELNA,Sanyo Poscap....QA350 and QA350 MOD V2 internal ... of the battery.) (Maximum supports of 55mm * 31mm * 16mm 7.4V lithium battery for model aircraft are available).Model aircraft batteries ... output matching impedance: 16 ohm --- 300 ohm Battery Type: 7.4V Li-Po battery of Model General Specifications, maximum size: 55mm ...