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Question: Will this let me charge my GoPro batteries using the USB port on my desktop computer or laptop?
Document: I really only wanted the dual battery USB charger, but didn't see it as an option. I decided to buy this kit for a few $$ more with the wall charger, car charger and 2 batteries. I have used all pieces of this kit and all work well. This kit works great with a backup battery like the Jackery Giant for using when you are away from power. On a recent trip into the boundary waters canoe area, I used the wall and car charger to charge my Jackery.
So this has not been useful to me because I am back to using the GoPro, with battery installed, in order to charge.Good:  The batteries themselves work, which is nice because they do drain fast when I have the GoPro's wi-fi turned on.
I love the idea of being able to charge to batteries at a time for the GoPro. At home the charger worked great to get all my batteries charged. The Smatree batteries lasted as long as the GoPro branded batteries in the camera. I went to the dunes and needed to charge the batteries while in the truck. It was the first time using the 12v charge adapter. Within an hour the battery charger had melted the back of the charger. I had no problems returning the item and just received my replacement.
I read the reviews, prior to purchasing, and they were mixed, so I took my chances. My reason for purchasing this item was I liked the idea of having extra batteries and a way to charge them via a wall outlet, so I can still use the GoPro.Problem:  It won't charge! I have played with this item and my issue appears to be the connection between where you insert the mini USB into the charging pack.
Phenomenal value. The batteries work exactly as the original GoPro batteries. The home charger as well as the car charger work great. In addition to charging the GoPro batteries the chargers can be used to charge any device via USB. The home charger has a blue light when connected, in my opinion it is perfect for finding and connecting USB cables to the charger at night, not too bright, just right.
The batteries for the GoPro drain quickly especially if you use the Wifi remote feature. I needed supplemental power and these batteries work like the original. The charger is quick, easy to pack and also can be used to charge any USB device. Just a tip:  use a white Sharpie and number or mark your batteries to help you keep up with which ones are charged and ready to go and which ones have been recently depleted.
I wanted to LOVE this product. In theory this is exactly what I needed, a way to charge the GoPro internal batteries via USB power. And as a bonus, the unit is tiny and charges two batteries at once! ...... if it worked.But it doesn't work. Within five minutes I found three major design flaws that conspire to make this product useless.1) The batteries do not fit in the charger tightly.
After using the batteries twice, one of the batteries will not charge any more,Its claims of being able to charge other stuff with the wall charger is not accurate. It would not charge my ipad, iphone, nexus 7 etc etc.. so.. whatever its rated for, it surely does not live up to its specs.
This is a great little package of batteries and chargers for the GoPro 3+ Black edition. It is awesome that you can charge 2 batteries at once whether plugged into the wall or into a USB device it seems to work. I have only cycled one of the batteries through one time and it had life that was equal to the GoPro OEM. The other battery arrived with a small piece of the plastic connector broken on the battery and I contacted Smatree customer service via email.
I have tried different positions, using some pressure from other objects to hold it in at the angle it seems to like, and it just isn't enough; it wants a certain position and angle that only I can re-create with my hands. The USB cable doesn't seem to be the problem as it works with my pc, so it is the fitting into the charging pack, which also works, if I hold the mini USB in it.
Answer: Yes you can charge the batteries from ac 110 v and usb from pc