Save, don't print from browser.
Print 100% size 150dpi
edges of image are 153 x 137 mm (6" x 5.4") approx.
Maplin would like about 13 Euro for a PP9 or a 996 here. I can get Eveready 996 3.50 to 4.00 and some brand I never heard of for €2 a Cheap source of "F" cells. Though I was amazed my Decca Transistor set takes 2 x 996 native!
The PP9's I refill with 6 x AA Alkaline.