10 December 2010

most of geo-apps are instantly require gps signals, then the smartphone can stand for few hours, I think most of phone less than 5 hours. 
If you do a lot of web page viewing, photo taken, display always on. the smartphone will be useless.
Or for professional user, they need extra battery for smartphone phone.

Here is nice article

Smartphone Battery Life

Have a backup handy--either a spare battery for a case with a built-in battery.
Most phones pack in Lithium-ion battery, or Li-ion, ranging between 780mAh and 1200mAh. Phone batteries have a limited number of charge and discharge cycles, usually falling between 300 and 500. Beyond this lifespan, batteries gradually diminish below 50 percent of its original capacity. Whichever way you look at it, you'll probably need a new phone battery each year. Vendors shipped phones with proprietary chargers in the past that only worked with a specific phone. However, most newer phones ship with a USB charger for AC power that can be used with any phone, provided you have a cable with the standard USB connector on one side and a connector for your phone model on the other. Some phones ship with an extra battery and others, like the iPhone, sport a sealed-in battery that Apple replaces for a $79 fee. Battery life and charge cycles vary by the operating system, phone settings, network type (WiFi, CDMA/GSM, 2G/3G), and programs used.
Smartphones require lots of juice
Dumb phones (low to mid-end) provide around 400 hours of standby time and more than ten hours of talk time. Smartphones, however, are essentially tiny laptops that have lots more going on inside them than ordinary phones. Hence, they draw more juice. High-end smartphones provide up to ten hours talk time and up to 300 hours standby time. A typical smartphone features around five hours talk time on 3G (2-3 times more on 2G) and 150 hours standby time. However, these figures drop sharply when you play media and games or surf the web. Whichever way you look at it, you should buy a reserve battery because a typical smartphone won't carry you through the work day on a single charge. Business users who travel a lot should buy extras like car adapters and traveler kits. When evaluating a new phone, check its rated battery life and pay attention to testing conditions. For example, vendors usually conduct battery tests with 50 percent brightness, WiFi turned off, and no media playback. These settings skew the battery life unrealistically and rarely reflect real-life usage scenarios.
Buyers should note that some phones have removable batteries and some don't. While this isn't a major feature for most people, and lots of buyers will value the slim designs allowed by non-removable batteries, it is something to keep in mind. If you are a heavy phone user who makes a lot of calls and sends emailsconstantly, then you might want to keep a spare battery on hand. Many phones, like the iPhone, have cases available with built in batteries, but they add a bit of size and weight to the device. They are a good work-around, but they might not be exactly what demanding users are looking for.

Xiaoyu Guan (Sam)

No comments: