hi all

i won an auction on ebay and now have a thunder power poly charger 425 model. it has a cell number button, a current button and a voltage button. and a start/full button. when you start a blue light blinks quickly. but some times i hear an audible cherping and sometimes i dont. if this charger is working correctly what will i see and hear and what does it mean?This charger came with no documentation but i do recall someone telling me that it would automatically decide on the number of cells if you do not. I charged a 1320 ahh 3 cell pack and noticed the super bright led .sometimes they blink and sometimes the cell count led will walk back and forth alternating between 4cell and 3 cell I havent a clue what any of this means or even if it is working correctly . what would the max current you could hit the batterys in order to charge the packs in the shortest time. and also the safetest way to charge