These batteries are rated with 1.2 volt, capacity is marked on the cell and is usual in the 2000mAh to 2700mAh range.
According to Sanyo the battery will work down to 0°C, but with reduced capacity.
The shelf life it not rated for rechargeable, but depending on type they can retain charge from a few weeks to a couple of years.
The battery weights 26 to 30 gram.