Trackpower help

[Team No Idea]

Hi all, just a quick qestion for you...
I've just popped my lipo's on charge using the standard Trackpower charger and balancer set. I use it every week at Faversham with no problem.
But tonight whilst charging, the green light next to cell#1 on the balancer kept flickering on and off throughout the charging process.......does anyone know what this means????

Thanks