I have a 2004 HCH displaying P1600 and P1433 DTC codes (failing battery). I have heard that grid chargers can fix this issue. The charger from Hybrid Automotive seems to be the best one at the lowest price:

http://hybridautomotive.com/gc/

Has anyone here installed one in their car? I\'m curious to hear about results before shelling out $400 for one.

Thanks!
Steve