Not comparing like with like but my Panasonic Lumix G2's battery pack will take many hundreds of photos and dozens of videos on holidays before it needs a charge. It's a 1250mAh 7.2V Li-ion battery and is very light.
My old Canon compact camera takes 4 x AA's and on high capacity AA's it too could take hundreds of photos. But those batteries weigh a lot more than the Li-ion but that's not surprising. That's NiMh vs Li-ion for you. And a charger for AA's weighs more than the Panasonic charger.
So I'd seriously consider propietary Li-ion batteries for a compact camera even if it increases costs. I was originally going to get a spare battery for the G2 but I've found no need. When it starts getting low I'd charge if necessary.
So just as a more scientific comparison the Li-ion battery is about 2oz and the 4 x AA NiMH 2000mAh batteries comes to about 4oz. And overtime these aren't Hybrio's so lose charge but the Li-ion does not.
And as another comparison the G2 (interchangeable lens etc.) with the stock 14-42mm lens is about 22oz with the battery. The old Canon A95 with batteries is 12oz.
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