ISDT K1 100W AC / 250W DC Dual Port 2-6S Smart Charger

Excellent!

This charger can charge different types and capacities of batteries simultaneously. This feature is essential for me when traveling since I can charge multiple 3s packs for my FPV goggles while also charging a pile of 1s packs for my quads, all in one go. The only downside to this charger is that it cannot storage charge batteries, but that's too big of a deal for me.