[RobD]

I can't remember what the LEDs do now, I recall that they vary the rate of flashing, but not sure what happens when they're fully charged.

That said, I didn't think much of those chargers, so I just bought one of these:
https://www.hobbyking.com/hobbyking/stor...ctors.html

I can parallel charge 5 batteries at a time and can also storage charge them too.

This is also an option:
https://www.hobbyking.com/hobbyking/stor...lugs_.html