Battery power consumption depends on factors such as network configuration, signal strength, operating temperature, features selected, vibrate mode, backlight settings, browser use, frequency of calls and voice, data and other application usage patterns.
Highly condensed lithium polymer battery delivers an incredible amount of juice in a small form factor and features built in overcharge, short circuit, and temperature protection.
Better yet, it features a "hard drive heater" for startup and operation in freezing temperature and enough internal diagnostics to prevent damage in extreme cold and heat.