Here's the blurb from B&H:
The sophisticated ULM9 contains a smart charging management system, which monitors battery types, capacities, and initial internal resistance, then automatically applies the most appropriate charging current based on this data. The device also provides battery condition monitoring, carrying out a health inspection based on resistance at the time of installation. A cell's health bar will appear on the LCD display, which also shows capacity, voltage, and percentage of charge completed. When a battery's health has declined to the lower limit, the bar will start flashing to alert you that it should be replaced.
The ULM9 offers a mechanical reverse polarity protection mechanism that prevents charging from occurring if an incompatible or incorrectly installed battery is present. Additionally, the error message "EE" will appear on the LCD to notify you in the event that a short-circuited battery is detected. Yet another helpful feature is the battery recovery mode that restores dormant cells to active duty.
Built for durability, the ULM9 is made from polycarbonate and ABS plastics that are corrosion-resistant and fire-retardant. When this toughness is coupled with the convenient compactness and considerable versatility of the ULM9, the result is a charger that's ideal for travel, camping, and almost any other adventure in your life.
I like to travel light. I never check a bag and can go two weeks with a small duffle bag (see onebag.com) Any weight saving I can do is a bonus. I do carry a USB charger for my phone and use that to charge my Fuji X100T. Also many airlines are putting USB jacks on the back of seats rather then 120V. It just makes sense to double up.