It depends on how you use and maintain it.
The Samsung Galaxy Note II (T-Mobile) has the longest battery life for a smartphone. The website Lap Top Mag offers a look at the top 10 smartphones known to have the longest battery life.
Sanyo and Samsung both make camcorders that have the longest battery life.
The larger PDA phones such as the Blackberry tested out as having the longest battery life.
All of the radio models share the same battery life.
The acer netbook claims to have 8 hours of battery life, which is far more then most laptops,
The best rechargable battery with the longest life span would have to be the new Hybrio rechargable batteries .
Any of the digital atomic clocks have a battery life ranging from 2-3 years.
It has to be Doogee S58 Pro. It has 2-3 days to battery life.
Energizer: They been doing this the longest and have the best batteries to use for recharging
The Canon entry-level camcorders have great battery life, and you can buy external battery packs to add even more juice.
Galaxy note 2
Lithium Ion (Li ion)