So, I have the D70 charger sitting beside the D200 charger. The former is larger, is the MH-18, the latter is a touch smaller, the MH-18a. Are they compatible for battery charging? The 18a does not have an extra contact, just the + and - like the 18, so it would not appear that the internal chip is doing anything. Anyone know for sure? Also, I have a Digital Camera Battery, 350w one of the older ones. In checking with the manufacturer regarding the D200, the same cable for the D2X/H will work for the D200 as well. Same as the AC adapter. Anyone know why this would not work?