i'd also say charger A seems fine,
my chargers dont have ballancing ports so i have seperate ballancers, when i charge any battery nimh or lipo i charge at 1c and it takes about 10-12 seconds to get to the optimum (1c) charging level,
as soon as it reaches 8.4v the amp output starts to decline until it gets to 0.10amp and then beeps and charge is complete,
same as your A charger by the sounds of it,
you are charging at 1c arnt you...
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