170 shots on a single battery that to only fair amount of flash usage nope this is baad.
My cannon gives me around 700 dhots with 2 aa cells which are very easy to replace and a good amount of flash and reviewing usage.
who will buy such camera? this is more of a toy than a camera.a
did you bother to chk the battery rating for both the cameras i.e your canon and the NV3. the NV3 uses a 860mAH battery and you could be using a 2600mAH or a 24mAH rechargable AA batteries.