Typing in Leica X2 battery at Amazon will lead to several choices with amazing price differentials. The Leica X2 battery being the most expensive ($119). Another battery, made by Wasabi, is for $16. There are others. I want to get an extra battery but would rather not spend $119. Any recommendations? Olympus makes the VF-2 viewfinder which works with the X2 but I would rather get an optical viewfinder. Any recommendations? The Leica optical vf is around $900, but surely there is another company making such things much cheaper. Does the VF-1 by Olympus work with the X2?