Rechargeable batteries are usually not an option for cameras unless the camera has been specifically designed for them. Any replacement battery(s) must have voltage, amperage, and discharge curves identical to the recommended battery.
The following batteries are NOT interchangeable for electronics use because of the voltage differences.
carbon-zinc, alkaline 1.5v
ni-cad rechargeable 1.2v
lithium > 3.0 v
On the basis of voltage a single lithium battery may be used to replace TWO alkaline batteries that are used in series but the amperage may not be correct.