Takes a long time to charge. Charge doesn’t last long.

Solar panel folds and is difficult to position. Panel also is very flimsy and I'm concerned about breakage. I battery days ago and have had it in full sun for two days. It has been overcast at times but has not gained a single bit of charge and says the same time remaining as the initial charge. I have it in the same place I have other solar charging devices to be used during storms. The charging cord plug into the device is awkward as well. You have to use a usb connector. I can see this easily being hit and knocked into and breaking. Unless it proves me wrong by tomorrow afternoon, it will most likely be returned. If it won't charge, it isn't worth having.

It was worth the novelty to buy this on sale. For some reason everything mine does is in 17 watts. No matter what charger I plug in it charges at 17 watts. It discharges at 17 watts and even the solar panel, in direct sunlight outputs 17 watts. I even plugged the panel into a different battery pack and it showed 17 watts.

Small and Compact Power Battery Storage

This is good for reliable charging while traveling or camping. The solar panels are adequate but also slow typlical of solar.

This device works well for small devices such as cell phones and rechargeable batteries. The battery charge hold is decent, but it takes forever to charge in the sun. It may charge better in the spring or summer when the sunlight density is much higher, but in the late fall and winter it will not sufficiently charge even with 8 hours of direct sunlight. I was only able to get between 34 to 52% charge from 8AM-4PM on sunny days with no clouds in mid November.

not know the type of usb it has

Watt brick 100 watt portable power station

Great for charging phones during power outage or hurricane

Nice battery pack, but instructions do not mention anything about requiring the use of "trigger cables" or "power delivery cables" to get voltages other than 5 volts from the USB ports. Once you have one of these cables, the adjustable voltage type, then the voltages listed will work.