Customer Ratings & Reviews

Bought when it was on sale. 5V 1-amp. Compact, pocket size, but wish the USB cord was a bit longer. First charge of the power bank took more than 4 hours. Green LED blinks when charging and turns to steady green once charged. Would recommend to anyone for the size and price.

I purchased 3 of them cause thought $7.99 each was pretty good deal for 4000mah charger, however mine dont have the same indicator lights to let me know if they are fully charged or dead? Only have a little blue led on top when charging, but no indication if 1/2 charged, fully charged, or dead. So I was disappointed to not have the same indicator lights in online description. Still a good value charger for the price though...

I work overnight & listen to Pandora through my Bluetooth earbuds during my shift. The problem is that both my phone and earbuds would die about 2-3 hours before my shift was over, and music is life, so I had to remedy this problem. I bought the smaller Dynex 2000 mah power bank first, and it offered enough juice to charge either my phone OR my ear buds, but not both without being recharged first (which defeats the purpose). I bought this Tzumi power bank because it was on sale and came with a mini charging cable, so it's small enough I can keep it in my pocket until needed. I can take turns charging both my phone and my earbuds on one charge, at least enough to finish out my shift. Everything I needed it for! The mini USB cable is a bonus, as most power banks either don't come with one, or they come with a long cable. This would be great for travel, and I plan to use it when going to concerts/sporting events also so I stay juiced up for the entire event. I bought another one to give as a gift. Wish I had bought a few more!

Its portable and about this size of a average persons hand. Its not heavy at all but does not feel flimsy or as if it is going to break. It also charges your device relatively quickly, although not as fast as something bigger with more power behind it obviously. Still great to have on hand when you know you are gonna be out for a while without anywhere to charge your device.

This is a small battery back up. Both in size and capacity. It’s only 4000 mah but that’s very much inline with its diminutive size and price. It’s fairly light as well. It comes with a usb/micro usb cable for charging (no lighting connector if u have Apple). I like it for tossing into a pocket or backpack as it takes up little space.

For around 6 bucks you cant get mad for being little heavy and small led on top. The picture is wrong. The circle led isnt true. Got 2 more from different best buy and they are the same. Used it for few days. Works well.

We have a teenager who is always listening to an iPod. No matter where we are she inevitably drains her battery. This recharges her battery in very little time. It is light and small enough to carry and wonderful for travel. I will watch for a sale to buy one for myself.

This power pack seems to work fine and is great for those times you are out and about and need to charge your phone where other alternatives aren't available. I also use it as a power source for a decorative Firefighter LED night light I have. it works great and will power the light for hours and hours. It recharges fairly quick. I actually have two. One dedicated to my phone when out and about and the other dedicated to my LED light. The LED light came with a very short cord so where it is located there is no wall socket available so this come in very handy. I'd recommend them especially for the price.

I picked 4 of these up for stocking stuffers and they're great in a pinch for juice on the go. Instant power without being tied down to a wall outlet. Great price.

got this becuase it is small and it is not heavy, works very fast in charging my cell phone.

The battery is worn on my mobile phone and would cost hundreds to replace, so this this light and portable charger powers my mobile device all day, so I don’t have to be hunting for an outlet. Got it for only $5 on sale at BBY making this deal even more juicy.

We use these for work. These chargers usually enable us to do two full recharges on our iPhones. I have not tried them on anything larger. For the price, they are hard to beat. We also use the Insignia 5,000 mAh chargers as well. Those are also a good value.

While shopping in BB, we came across this charger for only 5 dollars. It works well and was a bargain.

I have been hauling around my battery back up which is twice the size of my phone. This saves me room in and weight off my purse. It was very reasonably priced. I hope that it works as well as reviewed.

Good price for 4000mah Easy to use just use the cord with socket plugin to the electrical source and it charges easily good to carry in your car in case your iPhone gets low battery

Nice charger it’s small but he charges a lot he charges quick and the charger itself is small enough to fit in your front pocket in the court short kill.

We bought this portable charger for our son who was needing a extra boost of charge, very impressed with the size, power, and especially how fast it can charge. Definitely recommend

This batter holds a lot for its price and delivers a charge fast. It is slightly slow to recharge but it can fully charge my phone in about 2 hours so its well worth it.

This charger is fast and effective. I am able to fully charge at least two iPhones (6s) within two hours, and there is still more charge for extra use.

I love the size of this, very handy to have so I have bought 4 more for gifts!! Charges my phone twice.