I remember a few years ago, "fast charging" was not necessarily recommended. Why? It was due to innapropriate handling of the heat generated from the rapid charging, which almost certainly would result in fried batteries, in addition to the equipment itself being damaged. I still recommend to viewers to be very careful when purchasing a generic charger in your favorite grocery store or all-purpose store. The chargers are still cheap, because the retail chain does not care about safety or performance--it cares about cost and bottom line, and from my own personal experience are outright dangerous and hazardous. In fact, I'm surprised they are even UL approved.
Now, let's get to the good news.
The MH-C401FS is not your average charger. Maha is in the business of not only rapidly charging your batteries, but keeping your equipment safe as well. In addition, the technology is much much better than what it used to be. Maha's MH-C401FS is one of those chargers which takes advantage of the latest discoveries of "Rapid Cool Charging". If you so happen to find Maha chargers in your favorite all-purpose store, thank the store for making a wise decision. Somebody knows a thing or two about battery chargers.
Different than the MH-C204F in quite a few ways, the MH-C401FS model has two charging modes: Slow and Fast. Finally you have an option of how you want your particular set of batteries to be used. More than likely, if you're reading this review, you are a photographer who owns several sets of batteries. Some of us even inscribe the date on them so we know how old they are, and even number them in sequence for equal-cycling purposes. Of course, you could be someone who owns several remotes which take AA and/or AAA batteries, and you're trying to figure out what to do! Well, look no more, because I have found an inexpensive charger which can make your life very uncomplicated.