My PowerShot A720 IS digital camera (from 2008) permits AA-size 1.2 V NiMH or regular disposable AA alkaline batteries. Can I use AA-size 1.5 V Lithium batteries?
The manual (pdf) warns against nickel-cadmium, but doesn't mention Lithium:
This camera uses AA-size alkaline batteries or Canon AA-size NiMH batteries. While it is possible to use a size nickel-cadmium batteries, performance is unreliable and their use is not recommended.
EDIT: Here are the proposed Lithium batteries.