Save your smart-phone batteries!

If you have a smart-phone, you are probably painfully aware of this: sometimes, the battery life isn't the best.  Batteries lifetime on these phones obviously vary pretty significantly, but on average, the iPhone 4 can last up to 40 hours with regular use, Droids can last at least up to an entire day and Blackberries vary depending on the model.

This being said, if you are a regular smart-phone user (and so many of us are), you may need to make your battery last longer than the average.  Here are some tips on how to do it:

• Full drain your battery at least once a month.  Doing so will help minimize a loss of capacity for your battery.  
• Keep your phone as close to room temperature as possible.
• Turn off any features you aren't using (bluetooth, GPS, WiFi, etc) - those features will just drain your power.
• Put your phone in "airplane" mode when you are out of coverage areas.  When you are back in a coverage area, take the airplane mode off - otherwise, it won't ring or give you E-mails!
• Dim your screen.
• Lock the phone.
• Update your Apps regularly - updated apps frequently drain less battery.
• Close programs that aren't running - most smart-phones allow for Apps to run in the background, even if you aren't using them.  Again, this creates a drain on your battery life that you don't need.

Sources:

• The average battery life of an iPhone
• Improve your Anroid's battery life