I own about 6 sets of AA batteries for my Pentax K100d. This charger works well to determine which batteries are ready to retire for other uses. I like to be able to monitor the battery voltages and set the charging current. If I send a set thru the refresh recharge cycle and they don't improve on performance then I know their done. I can perform a quick charge by setting current output or let them charge with less when time is not a factor. I also like the trickle charge the batteries get so they are ready to go. Read the manual, it covers everything this charger has to offer. Happy with the purchase.