Good idea.
It'll do two at a time and tell you how they did. And that info is priceless.
And it's price covers it working in the shop on AC, and at the field on DC.

When I get home, I plug in my TX and the RX of the airplane I flew the most. Go eat supper. Come back to the shop and look at the readouts of the two batteries. I remember how many flights I got on each and compare what I expected for battery use and what actually happened. Anytime a pack seems to have given up too much capacity for it's use, I cycle it overnight. Next morning I know if it's on it's way out. I've spotted two in the last two years. One was very new. One was about two years old, but in my favorite airplane.

Good charger.