Why not just use ONE 1,5 volt battery and then step up the voltage with this:
http://www.microchip.com/wwwproducts...mpaign=MCP1640
or other similar step ups from Microchip that work downt to 0,35Volt?
And if you want really low active current of about 4uA but at the cost of 0,85volt of Vin, this is the best choice:
http://www.microchip.com/wwwproducts...oduct=MCP16251
Ioannis
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