Here not the fastest load race, but a charger that will take care of your batteries. He treats each battery independently (of quality). He tested the black Amazon batteries, and they do well in 2500 mAh as shown. The manual is very simple, even if the traductionfrançaise is below the English version in two minutes we understand its operation. Anyway without touching anything it put its batteries and it is expected to be full on the screen. The base load is 600 mAh is long enough, I spend 800 mAh 4 batteries, and if I put an emergency mode max 1500/1800 I think for 2 batteries. Great buy for me.