So, I had my Scarlet running while I was working out a monitor issue - a single battery in the Side Handle. The battery ran down, power dropped and the camera shut down. I quickly removed the REDvolt and slipped it into the charger. However, the light first turned green, then red, then started blinking green to red. Hmmmm... faulty battery? Faulty charger? Both had worked fine before.
Noticing the battery felt a little warm, I waited about ten minutes and tried again. Everything worked fine. I guess the charger doesn't like to charge "hot" batteries.