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  • Kensington K33497US PowerBolt Duo Car Charger, iPhone 4 Compatible
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Kensington K33497US PowerBolt Duo Car Charger, iPhone 4 Compatible

| 13 answered questions

List Price: $36.95
Price: $12.99 & FREE Shipping on orders over $35. Details
You Save: $23.96 (65%)
Only 16 left in stock.
Sold by Sunset Book & Gift and Fulfilled by Amazon. Gift-wrap available.
  • Two Powered USB Ports (2.1A & 1A)
  • 2.1 Amp USB port has the power to charge your iPhone, iPad or iPad Mini
  • 1 Amp USB port charges your iPhone 5/4/4S/3G/3 (must use own cable for iPhone 5)
  • Detachable 30-Pin to USB cable charges & Syncs from your computer or charges from your car
  • 2.1A Port provides Fast Charge to iPhones (iPhone 5 cable not provided)
$12.99 & FREE Shipping on orders over $35. Details Only 16 left in stock. Sold by Sunset Book & Gift and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

Kensington K33497US PowerBolt Duo Car Charger, iPhone 4 Compatible + Car Mount, iOttie Easy One Touch Windshield Dashboard Car Mount Holder for iPhone 6 (4.7)/ 5s/ 5c/4s, Galaxy S4/S3//S2. HTC One-Retail Packaging-Black
Price for both: $32.98

Buy the selected items together

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Technical Details

  • Size (LWH): 1.25 inches, 5.25 inches, 7 inches
  See more technical details

Product Description

Product Description

Charge two devices while you drive. Charge two devices simultaneously with the PowerBolt Duo from Kensington. It features two charging ports: the powerful 2.1 Amp port has the juice you need to charge your iPad, while the 1 Amp port simultaneously charges your iPhone, iPod or other mobile devices. Includes LED power indicator. Compatible with most vehicle power ports. iPhone and iPod touch models require iPhone OS 3.0 or later.

From the Manufacturer

Charge two devices simultaneously with the PowerBolt Duo from Kensington. It features two charging ports: the powerful 2.1 Amp port has the juice you need to charge your iPad, while the 1 Amp port simultaneously charges your iPhone, iPod or other mobile devices.

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Kensington PowerBolt Duo Car Charger, iPhone 4 Compatible

Kensington K39224US

Kensington PowerBolt Micro Car Charger for iPad, iPhone and iPod, including iPhone 4

Power Type Portable Battery Car Outlet (CLA) Car Outlet (CLA)
Power Charge 4400mA Hours (2.1A charge) 2.1A + 1 Amp 2.1Amp Charge
User Environment Anywhere Car Car
Features 5 extra hours of power, plus protection and a convenient stand Charge two devices simultaneously with two charging ports: 2.1 Amp port and 1 Amp port 2.1 Amps, ultra-compact car charger


Product Details

  • Product Dimensions: 1.2 x 5.2 x 7 inches
  • Shipping Weight: 2.4 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B003PU01M4
  • Item model number: K33497US
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (775 customer reviews)
  • Amazon Best Sellers Rank: #30,048 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories)
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Customer Questions & Answers

Customer Reviews

4.2 out of 5 stars

Most Helpful Customer Reviews

434 of 443 people found the following review helpful By wizozzie on November 30, 2010
Verified Purchase
This is a great dual port car charger.

Unlike a lot of dual USB chargers out there, it puts out a good 5v 2A current out of the top jack, and an above average 5v 1A current out of the bottom jack.

If you use a car dock (especially the Google/HTC Nexus One Car Dock) you can charge your phone and run your dock with a regular high quality Micro USB 2 cable. This saves a lot of headache if you are using a single Car DC jack for multiple devices. So, you can run a GPS Android Phone Dock, along with a standard iPod/iPhone USB 2 cable with no extra adapters or dongles. Mega space savings and clutter prevention.

The charger juts out about 1 1/2 inches from your standard sized DC jack surface. I can see why they needed to do this versus making it more flush to the car panel. The thing gets warm with full load and needs the extra space. I believe they made the Powerbolt Duo as small as they could for the price.

Speaking of price, this adapter uses high quality plastics and seems more expensive than its MSRP price. Although the metal contact pieces are not of a high conductivity metal, I expect that it would not corrode even with the occasional car style beverage spills and drips. The 30-pin Dock cable that comes with the unit is the standard Kensington iPod cable quality. The cable itself is flimsier, but it's reinforced where it counts. Apple cables usually become separated where the cable jacket meets the connector. The included Kensington cable will probably last a few months longer with heavy use because of its reinforced areas.
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81 of 85 people found the following review helpful By K. Crawford on January 28, 2012
Verified Purchase
A quick summary of this product before I get into the details:

Likely great for dedicated Apple device users that has all the power it claims (simultaneously 2.1 Amps on one port with 1 Amp on the other for a total of 3.1 Amps output combined, but under performs DRAMATICALLY for non-Apple devices due to protocol issues for USB chargers. It gets 3-stars because all it claims to support is Apple devices.

Now for more details...

A little background on USB charging for those who don't know:

The USB power spec is for 0.5 Amps at 5 Volts... or 2.5 Watts. This was great up until the last couple years when devices have gotten really power hungry, particularly smartphones and tablets and to a lesser extent dedicated GPS's. Some of these devices use over 2 Amps, particularly the tablets like the iPad (or in my case the HP Touchpad).

Manufacturers of these devices therefore had a dilemma. If they had their devices pull more than 0.5 Amps, they risked damaging the power source, which could be a computer, that was only prepared to source 0.5 Amps. Thus the manufacturers have used tricks to determine whether their device is connected to an unknown source, at which point they purposely only draw 0.5 Amps, or to the dedicated charger that was provided with the device, where they can draw all the power they need.

There seem to be two common tricks used. The first is to short the two data-wires together in the charger. This is what most non-Apple devices do. Since a computer or older device wouldn't have done this, the device can assume it is safe to draw all the power it needs.
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98 of 104 people found the following review helpful By Paul Hughes on April 13, 2011
Verified Purchase
I second the other five-star reviews. This device outputs the power it states from both ports, and, consequently, can charge anything up to and including the iPad and iPad 2. It also runs cool even under load; it's a very well-engineered piece of gear.

Critically for Ford owners and other car owners whose cigarette lighter jacks are powered even when the ignition is off, this device has VERY low standby power draw. While this is not listed in the specs on the box, I asked Kensington tech support for the draw when the charger is plugged in but nothing is charging from either of the USB ports. The response: "We are sorry for the delay in the responce. We would like to inform you that the product(K33497US) draws approxmitely 5mA in stand by mode."

(I had another iPad charger that would drain my car battery in a few days when left plugged in but with nothing charging. The Kensington seems not to have the same problem.)

In short, of all the high-powered car chargers out there for iPads and similar devices, this is the one to get.
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142 of 158 people found the following review helpful By Leonid on August 23, 2011
This charger is specifically for what it says in the title - iPhone 4, iPad 1 and 2.
With any other USB device you will get a 0.5A max current on both ports.
I bought this one for my Android phone thinking that USB charging specs are all standard. I was wrong...

From a review on another site:
"The 2.1A port implements *apple's* proprietary spec for high current charging which is necessary for that iPad, but the 1A port does not
implement the USB standard for high current charging above 500ma for smartphones and other devices. It may be rated at 1A on that second port but the required connection between pins 2 & 3 that tells your smartphone it can use >500ma is missing."

UPDATE 2011.12.06
-----------------
I finally found a charger that will provide 2x1A for my phones.
[...]

There is a very useful comment on this item
[...]

(Due to censorship - see comments for details)

The one I've got had two pins in the middle soldered on one port but not the other. This way the soldered one was treated by the phone as an AC adapter, the other one as a USB port.
Soldering the other one made it look like an AC adapter as well. Now I have a fully functional 2x1A car changer :D

I believe the same applies to the "Kensington K33497US PowerBolt Duo Car Charger" - it simply has both ports not soldered and treated as USB devices by phones. And only Idevices can actually "talk to it" and figure out the proper current.
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