I have not used that charger but the specs look right - it will charge LiPo at up to 5A and handles 2 lipo cells.
Proper LiPo chargers use a method called CC/CV. It applies a Constant Current to charge the cells until they reach a certain voltage (4.2V per cell). Then when that voltage is reached a variable current is applied to maintain a Constant Voltage and stopping overcharging.
I have no idea what is the favoured LiPo stick pack right now. This market is moving very fast. The good news is that I don't think anyone has anything bad to say about any of the many hard-case packs on the market now, although try and test in the chassis before buying as the fit is not always 100% right on every car.
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