Any charger needs to limit the charging current in order not to damage the battery. Generally the higher current charger will recharge the battery faster, but might also reduce its life/number of charge cycles.
Here some websites:
http://batteryuniversity.com/learn/a...ion_batteries/
Says:
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Increasing the charge current does not hasten the full-charge state by much. Although the battery reaches the voltage peak quicker with a fast charge, the saturation charge will take longer accordingly. The amount of charge current applied simply alters the time required for each stage; Stage 1 will be shorter but the saturation Stage 2 will take longer. A high current charge will, however, quickly fill the battery to about 70 percent.
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http://batteryuniversity.com/learn/a...ased_batteries
wiki:
http://en.wikipedia.org/wiki/Lithium-ion_battery