I would not charge them at 2000ma but SANYO themselves say it is ok to charge at 2000ma with the proper charger.

I have been charging/using them for two years now and always use 1000ma on a Nimh peak detect set at 6mv, with no issues and perfect just starting to get warm at peak which is the indication of fully charged, if they dont get warm they are not fully charged, again as stated by SANYO.