Some high capability lipo chargers are those used in the airplanes and helis section.
Some of the examples are the following brands:
1) Schulze 330D onwards, chameleon series of chargers.
2) Orbit Electronics, they have the MicroLader Pro and the very portable PocketLader
3) Thunder Power TP1010c
4) Astroflight 109 (this uses pulse charge, which can be a little harsh on the the battery)
There are some more which i can't recall offhand.