Recently, I don't remember exactly when, I purchased the slim charger because one of the older model wall chargers (the one with the cord) stopped working (charger LED stays red, and nothing happens when I plug in a batt). It seems that we a few of my batts (i have 6 total, 3 in use at a time), when I "plug" them into the slim charger, although the batt LED blinks, the LED on the charger does not change from green to red, which to me indicates charging. I only charge the batts as needed, so I have my doubts as to the quality of the charger, and whether it works with all batteries. Has anyone else run across this, and can someone confirm that, even though the charger LED is green, that it is indeed charging my batt? Thanks.