Tzumi - PocketJuice Pro15,000 mAh Portable Charger for Most USB-Enabled Devices - Black

Great product Nothing more to say would highly recommend 1

My measurement is based on having a really old phone that pretty much needs to be constantly charging. I look at how long the device will keep the phone charging, without doing much on it. My favorite before this was 8000 mAh, because it would last most of a day. I tested this one carefully, because I wanted to know how it would fare during an outage. It lasted almost 56 hours. I'm not sure how that translates to heavier usage, but I was impressed, compared to other devices. (I had returned another portable charger that was supposed to be 12,000 mAh but died in less than an hour. I was told it must be defective, so I suppose it's not a fair comparison.) It has a power on/off button so you can save the charge. The only thing that was a bit confusing is that the first time you charge it, you have to ignore the charging lights that tell you how charged it is. Usually it shows you from one to 4 lights to show you how far along you are in the charging process, but the first time it gives you the 4 lights almost immediately. You have to ignore that and charge it for a long time. I think I did it about 12 hours the first time.

Works great ! I use it for my VTech camera. Will purchase another.

This battery pack is amazing. It holds a charge for weeks at a time without needing to recharge and that includes me using it to charge my beats headphones and iPhone 11 a few different times. I was very surprised to see that it still had juice left after I forgot to take it out of my work bag to charge my phone or headphones. Well worth the money and very reliable.

This lasted me about a year and then started having trouble charging but since I had the protection plan, I was able to just exchange it for a new one. Overall it works great, I take it on vacations or beach days and it charges all my devices (speaker and 2 phones) and still has plenty of power left. Sometimes I don’t charge it for an entire month because I forget to and am still able to use it.

Was able to charge my iPhone twice before half the charge was depleted from the battery. You can charge two devices at once. I did notice the battery shutting off a couple times while charging, pushed the on button and it began charging again.

Long lasting and my primary hiking portable charger. Long battery life and hadn’t given me any issues so far!

This heavy-sturdy pocket juice holds its charge over a long period of time, charges phones multiple times before needing a recharge, and charges a mobile phone quickly. I have a 12,000 mAh model by the same manufacturer (I've had it for years and it still holds the charge like it was new!) that charges also by plugging into the wall overnight. I bought this model thinking it did the same thing, but it does not.