If you own any tool with battery and charger, figuring out what all those blinking lights mean on the charger can be confusing when you just want to charge your battery. I inserted the Hart 40V lithium-ion charger with 8Ah battery packs into the charger. Just want to see what each light pattern means in actual situations.
The Hart 40V Charger has a clear LED status sticker attached on the front panel. For standby mode, the charger has power and is waiting for a battery, it would show solid red LED. It is pretty straightforward, just put your battery into the charger and it should start charging and changing to other LED status which I would mention in the next section of this article.
Hart 40V Charger LED Status Guide
I inserted the 40V battery pack into the charger. So the LED went from solid red to Blinking green light immediately. Blinking green light means the battery is charging normally. Charger ran through the charging cycle, and the green LED is flashing at the same time.
I waited for the charging cycle to finish. The LED was now solid green and not blinking anymore as it used to be. If it's solid green, the battery is fully charged and the charger has stopped charging.
Also you can check the battery's own charge indicator by pressing the battery level indicator button on the front of the battery pack itself, and all four blue bars lit up, means it was fully charged to the max.
For different battery condition, it would have different light patterns. If a battery is too hot from being charged, or just too cold due to winter, a red light blinks steadily on the charger. This is the temperature delay mode, which mostly all tool charger would have, waiting for the battery temperature to be in an acceptable range before starting the charge cycle again.
There is another red blinking that is irregular and means something else. A red blink that is in irregular pattern, different from the regular red blinking which means hot/cold delay, means battery error or the pack is defective and cannot be charged. That means the charger picked up an error with the battery cells themselves and not just the temperature.
This is actually more troublesome than the hot/cold delay.
The LED status light on the 20V Hart charger is same as those on the 40V charger. They kept the light meanings consistent across the different voltage platforms, which helps when you have multiple HArt battery systems in a tool lineup.
There are four major light states that you need to remember when you see them in action. A solid red light means the charger is on and there is no battery. When it blinks green, it means the battery is charging.
When it turns solid green it means the battery is fully charged and ready to use. Red blinking means temperature delay and irregular red blinking means battery error. The charger gave visual feedback on status at any moment.
