This is very good accessory during travel.
It was been good as my back up power pack to my iPhone it gave me the whole holiday so fine I was able to take picture n video my phone is always full of baterry charge .
I bought my first one of these about 2 yrs ago & kept it charged & used it for trips a few times a year. Until Pokemon Go came out this year then I've been charging it & using it for the last couple of months a few times a week. I was surprised that the battery is still holding up well & it will charge my Motorola Smartphone 1.5x. They're cheap when they're on sale or have a SYWR points back deal on them. It's very compact/small & light & I carry it in a vinyl backpack while I'm walking or biking but it also fits in juniors jean pockets just fine (those pockets can be quite small). It also will still charge my phone while I'm playing Pokemon Go, at the very least keeping up the battery percentage I started with.
This portable charger is fantastic. Great price point, perfect size, not too heavy. I love that it comes with a USB. I have seen way too many of these chargers without them.
I'm very happy with this power pack. It charges quickly and easily. It lets me use a Windows 10 tablet (at 25% screen brightness) for 4 hour sessions. It has never discharged fully when connected to the tablet. I like that the blue LEDs stay off unless the button is pressed. It saves energy compared to other power packs. It's great to use a power pack to reduce the number of charge cycles of a new tablet's internal battery. If I needed another power pack, I'd gladly buy another T4400.