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I use one of those to charge my Turnigy LSD NiMH batteries (Very similar to Eneloop; available from Hobbyking).
The called "smart chargers" have a chip to monitor the batteries voltage and temperature as it charges. As such they're safe to charge NiMH at 0.5-1C. The term "C" in batteries is basically the mAh rating.
So, if you have a 2200mAh battery, charge it between 1100mA and 2200 mAh. I usually go 1500mA for no particular reason.
Things to watch are:
1. Take batteries out of the charger when they're charged (after the charge is complete the charger switches to a low trickle, so leaving them in for more than a day or so does damage them).
2. If you put AAA batteries in them, note their lower capacity (i.e. 800mAh) requires that you lower the charge rate from the default (1000mAh on mine).
3. NiMH batteries much prefer this fast charging approach to the more typical trickle charge.
It's a great charger. Since I switched to the Maha and LSD batteries, I've never had to throw a battery out.
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