For consideration, one of the benefits of the Stratus Power is that it supplies 2.1 amps to BOTH usb ports at the same time. This means you can fully charge two devices at the same time WHILE you use them both, for example, an iPad running Foreflight for moving maps, and an iPhone running ForeFlight for checklists. The Guardian Avionics smartPower Dual USB Port [guardianavionics.com] also does this.

Some (not all) of the other ones with dual USB ports actually split the 2.1 amps between the two, so if you plug in two devices, neither of them gets the full 2.1 amps.

I have a Stratus Power in my plane and absolutely love it. I paid full price for mine a few years ago.

States I landed in N63420 while he was mine:
[Linked Image from visitedstatesmap.com]
KDCY

"Flying a plane is no different from riding a bicycle. It's just a lot harder to put baseball cards in the spokes." - Captain Rex Kramer