Life-span of battery can be extended a lot if it is properly maintained.
Display the power of free time (accurate to minute) depending on the device. You can then predict the power availability to avoid the embarrassment of lack of power.
When the battery power is below 20%, run Battery Doctor and plug in the charger, it can then help maintain your cellphone automatically during charging.
Provide dozens of power-saving tips. 3G, Wifi and many other features can be disabled to maximum the battery power duration.
