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Kensington PowerGuard Blue Solid PowerGuard Battery Case with Card Stand for iPhone 4/4S K39288US

  • Apple iPhone 4
  • Battery Chemistry: Lithium Polymer
  • Capacity: 4.44 Wh (Watt-hours) 1200 mAh
  • Dimensions: 5.1" x 2.4" x 0.79"
  • Weight: 2.47 oz.
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Slip the PowerGuard Battery Case with Card Stand onto your iPhone 4 and you'll have hours of extra power for web surfing, calls, apps and more. Plus your iPhone will be protected by the PowerGuard's tough case. There's even a handy card stand that props up your iPhone for handsfree FaceTime chats.

Learn more about the Kensington K39288US


Battery Case






Compatible Phone Manufacturer
Compatible Phone Model
Apple iPhone 4/4S


Battery Chemistry: Lithium Polymer

Capacity: 1200 mAh

Dimensions: 5.1" x 2.4" x 0.79"

Weight: 2.47 oz.


Adds 4 hours of extra talk, 5 hours of video, 22 hours of music (Extended talk time listed based on iPhone 4. As your Kensington PowerGuard is used over time, it will have a reduced ability to provide extended time and the time will decrease from that shown above.)

Provides the power you need to enjoy multitasking between apps, FaceTime calling and more

Insert the provided card stand and the two-position stand holds your iPhone 4 handsfree in portrait or landscape mode

Micro USB charge and sync port

LED battery indicator

Soft touch finish feels great in your hand

Built-in volume control button

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Kensington K39288US

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  • Donald S.
  • 3/20/2013 1:01:45 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsDecent battery case

Pros: Works as advertised, it roughly doubles the battery life of an iPhone 4. Fit is good and the case is nice enough.

Cons: Its not terribly clear what state the phone is in. There is a switch and different lights come on at different times, so it can be a little confusing what is charging what and how much life you really have left. As long as you charge the case relatively often you will be fine though.

Other Thoughts: Pretty good battery case for the price, but I wouldn't want to give it to someone who is technologically clueless.

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