RE: RC-POWER 601BC BALANCE CHARGER/DISCHARGER.
here is a 4407 that has the same foot print as the one in the charger. this chip is a pnp power mosfet here is a data sheet for it. [link=http://pdf1.alldatasheet.com/datasheet-pdf/view/146973/A-POWER/AP4407M.html]link[/link]