I've been dabbling with batteries lately while working on my home electrical panel so I'm always trying to try different chargers. This is a very simple device, it charges, that's all. Not to say it's bad, just not to give you details. works exactly as it should, I filled the compartments and they are all charged. As for the fast ones, I don't know, the adapter is 2 amps, I don't really know if "fast" or not. But it works. One note though, they say you can charge 6 cells of all battery types listed at once, which isn't entirely true. The slots aren't wide enough to load 6 26650 cells at the same time, so a bit off. Another thing is the price, just high and one of the reasons for the 4 stars. For about the same price ($32.99 as of this writing) or a little more, you can get a charger that gives you detailed information about each cell like capacity, volts, etc. It works, so you decide the price and you're basically okay with that.
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