discharging Tx pack?

[tallyram]

i'm using the adapter that came with the spektrum. i put a deans connector on it and plug one end into the Tx and the deans onto the charger. reason for discharging is that i have had these batts for 6 months without use. they only charged for like 5 minutes before peaking? tried repeaking, lasted 5 minutes again. i wanted to discharge and then charge to get a baseline. what do you suggest?