Looking too and wondering: what is the nominal capacity of the orginal battery? Does anyone know? Was brand and type written on it perhaps, marcins? (I'd rather open my DR1000 only once.)
Meanwhile, found another variety, which according to the website of Varta the Netherlands is distributed in my country:
Varta LPP 503759 DL (1300mAh)
Not sure that's any help, mimimum order quantity is 480 batteries
Seems these really are OEM parts, sold by Varta in bulk only. I've asked for these at my local store for electronics parts, but they couldn't get me anything of the sort - though generally speaking it is a really good store with a very wide assortiment.