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For the most part, the Wasabi batteries are Japanses cells, and not Chinese. BIG difference and they DO last longer, and are fairly inexpensive. You can find at bluenook dot com I've bought a variety of different ones for a variety of different cameras, and have had nothing but great luck. I use the heck out of them, especially for the S90.
With that said, someone "questioned" earlier in the thread, and I will ask as well, are you really taking that many pictures on one dive ?? Think quality, not quantity
How have you tested that or your talking about impressions?
If you put the camera in self shoot with full flash in sequence of 10 and keep going the canon battery lasts longer obviously you need to compare batteries at the same point of their life
Most people that have tested wasabi without flash say that they fall short at least 10% a canon battery that on paper has smaller capacity
I bet with flash there is a gap of at least 25%
Wasabi batteries in theory have capacity of 1400 mAh instead of the standard canon 1120 mAh
I doubt that they actually last longer but I would love to see a test
Generally what is very cheap is not very good and on batteries this tends to be even more true
I have a Canon NB-5L and an energizer compatible the canon gives me over 450 full flash shots I am going to put the energizer and give it a go