Ontek Universal Portable Battery Pack Charger for Smartphones and Tablets (4,000 mAh)

Up to 68% Off

Product Details


Free Shipping - Ontek Universal Portable Battery Pack Charger for Smartphones and Tablets

Get into the Juicing Lifestyle

These rechargeable lithium-ion batteries help ensure you’ve always got power when you need it. Whenever a smartphone or tablet is running low, just plug in the backup battery and you’re back in business, even if you aren’t near a power outlet.

Tiny but Powerful

The compact devices range in size—the smallest is about the size of a stubby cigar, and the largest is the size of a cigarette case—so you can carry them easily in a backpack or purse or keep one in an office desk drawer.

4,000mAh
  • One USB port
  • Charges a smartphone approximately twice
  • 1A output
  • Built-in LED flashlight
  • Product dimensions: 2”x4.25”x2”

cell-phone-accessories-guideSmartphone Accessories Buying Guide

From external batteries to selfie sticks, learn about the gadgets designed to make your smartphone even smarter.

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Customer Reviews

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Ontek Universal Portable Battery Pack Charger for Smartphones and Tablets (4,000 mAh)

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john k. Verified Purchaser
Sep 7th, 2017
Rarely used, but when I went to use it found it to be fully discharged. Odd considering that it hadnt been used. Isnt the point of these types of devices to hold power until needed?
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Heidi S. Verified Purchaser
Sep 14th, 2016
I went to use it for the first time and it didn't work. Disappointed.
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STEPHANIE M. Verified Purchaser
Sep 7th, 2016
Worked a couple of times. Then stopped. Will no longer change any devices.
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Lateefah S. Verified Purchaser
Jul 28th, 2016
I have tried and tried to charge my pone with this device and not able to. The light comes on and then it's hard to get it to turn back off. One time it looked like it was charging came back to check on it and it was not charging. I tried and tried and have yet to be able to charge my phone. Have to return it.
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Craig Verified Purchaser
Jul 26th, 2016
Bought this for my son. He loves it. Does what it suppose to. Great buy!
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S K. Verified Purchaser
Jun 20th, 2016
First, it will help if customers specify which item they purchased. The Power4000 model did not fully charge (at least not after 24 hrs). Item did not charge the cell phone using manufacturer's charging cord. Finally, the LED flashlight did not work.
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3 people found this review helpful
Jorge P. Verified Purchaser
Jun 1st, 2016
Don't buy this battery. It is terrible, it only charges itself and not your device. Waste of money...it does not even turn on.
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3 people found this review helpful
Faithe E. Verified Purchaser
May 26th, 2016
The Battery isn't charging my phone well. After placing the battery on a charge for 2 hours (until all of the lights were full). I then used it to charge my phone. It took several hours to give my phone 30% more power. After this point it kept turning itself off, and I continuously had to keep turning it on to give my phone more charge. I spent all night doing this. The phone never reached 100%.
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3 people found this review helpful
Tomesha S. Verified Purchaser
May 17th, 2016
It stopped working less than 30 days and I was unable to exchange.... It was just a lost cause! ... Before that it worked Great!
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Charmaine D. Verified Purchaser
Feb 20th, 2016
I bought this for the purpose of using it for my ipad. The adaptor does not fit the ipad, only my Mophie! Would not recommend....
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