RE: Batteries
Hi!
all NiMH batteries should be slow charged! That means chargin at a rate of 0,1C for 14-20 hours! In your case 200mAh for 14-20 hours using a simple wall charger
Charging a 2000mAh pack at 600mAh using a peak charger (Which isn't optimal for charging a NiMH pack because they all false peakt) is asking for trouble!