Review: IonSlim 5K Battery Pack for USB-C and USB-A

I was able to try the IonSlim 5K for USB-C ($54.95) from Moshi before it was released. Like other Moshi products, it's elegantly designed, with quality materials, including anodized aluminum. At 8.5 mm, it's also incredibly slim, almost as slim as an iPhone 7, yet it provides 5,150 mAh of power and Fast Charging at 15 Watts (5 volts at 3 amps), which is impressive given the thickness (or lack of thickness.)

What really sets the IonSlim 5K apart is that it has a USB-C port, and a USB-A port. Only one port can be used at a time to charge a device, but you can charge the battery pack using USB-C while charging another device via USB-A. Unlike many other Moshi battery packs, a cable is not built-in, but the pack does come withe a short USB-C to USB-A cable, which is something you might have to buy for $20 or more otherwise, making the IonSlim reasonably priced. You can use the cable in either direction, to charge the pack or charge another device. 


  • Incredibly slim... as slim or slimmer than an iPhone 7
  • USB-C and USB-A
  • Includes USB-C to USB-A cable
  • Charge battery via USB-C while charging USB-A devices
  • Reasonably priced


  • Need to bring (included) cable and may need your own USB-C to USB-C cable

Final Verdict

The IonSlim 5K for USB-C from Moshi gives you a lot of options and will be a good addition to the travel bag of anyone who uses USB-C, which is becoming increasingly popular. 

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Author Details

Todd Bernhard's picture

Author Details

Todd Bernhard

Todd Bernhard is a bestselling (6+ million downloads) award-winning (AARP,,, Digital Hollywood, and Verizon) developer and founder of NoTie.NET, an app developer specializing in Talking Ringtone apps including AutoRingtone. And his profile photo is of the last known sighting of Mr. Bernhard wearing a tie, circa 2007!

An iPhone is almost always attached to his hip or in his pocket, but over the years, Mr. Bernhard has owned an Apple Newton, a Motorola Marco, an HP 95LX, a Compaq iPaq, a Palm Treo, and a Nokia e62. In addition to writing for iPhone Life, Mr. Bernhard has written for its sister publications, PocketPC Magazine and The HP Palmtop Paper.