Speedlight V2 gates must be charged with the supplied charger (19V DC 3AMP)
The Speedlight gate has a single RED led labelled CHG.
Under fast smart charging, the LED is illuminated
When charge is complete LED will extinguish (this indicates charger is in trickle mode)
It is possible, if you battery is very flat, that the LED will not illuminate when the charger is first connected. After a period of time the smart charger will have lifted voltage levels to a level where fast charging can begin.