9 volt nimh batteries

possibly a li-ion rather than Ni-MH read the fine print, you may need a different charger.

200 mAh seems about the right capacity for a "9v" costruncted of 6 Ni-MH AAAA-size cells

it's important to remember that with these provucts "9V" is the size, not the output voltage.

--
umop apisdn

** Not true - the ERBL "6F22" 9V is a Li-ion battery

So it likely has only 3 cells inside (maybe only 2).

A NiMH type will deliver high current if needed and still maintain its rated capacity - unlike a Li-ion which will not.

So if your app draws 250mA or so - go for the NiMH.

... Phil