I had a Streamlight Stinger a number of years back. Somewhat more recently I had a Streamlight Stinger LED and an individual charger and never gave it a whole lot of thought. Now, at a new job, we have a bank charger and I am told that the charger LED blinks when the light is "topped off". Does that necessarily mean that it is a "smart" charger or is there more than one type of bank charger and they all have a flashing red LED at some point?