Carbon Battery 6K USB-C Rechargeable Lightweight 6000mAh Waterproof Power Bank Sticker

This is an impressive battery bank for its compact size and light weight, but it does come with some limitations. Don't expect to be fully charging up multiple devices with this unless they have tiny batteries. It has enough capacity on a full charge to charge my pixel 9 pro from about 5% to about 85% before it's fully drained. Charging speed isn't incredibly fast but it isn't slow either. It took between an hour to an hour and a half to fully discharge the battery bank. It does also get decently warm to the touch when charging/discharging, but not enough to be concerning or harmful. The battery bank also has only a single bi-directional USB-C port to charge itself up or charge a single plugged-in device. All those limitations aside, the compact size and acceptable capacity makes it perfect to pair with a short USB-C or multipurpose 4 in 1 cable to throw in a pocket, bag or an EDC kit. This will be great for times a device may need a bit of a boost to help you out of a tough spot or you just need a bit of extra power on a long day without wanting or needing to commit to a lugging a full sized battery bank around. This is a great little product for what it is.

Functionality really good, quick charging speed good utility battery. Life can charge a device fully depending on how low your battery is. It’s really portable. Charging capability really good.

This compact and sturdy power bank charges my phone fast. I like that it’s usb-c so that it works for most phones. It’s easy to carry in my small purse and it’s quick to charge it back up too. It does get pretty hot when it’s charging my phone so it’s probably best to keep it out in the open when in use. I like it. I’ve also used it to charge a portable air filter without issue.

Top of the heap. This is all it's advertised to be: small, light, easy to charge and great to use. I sound like an employee of the firm I'm sure but hey when something is good I got to share.

Very compact and fairly light charger. Not sure if the battery capacity is 6,000 mAh, but I was able to charge my aging Galaxy S10 plus that comes with 4,100 mAh battery from 19% to full with no issue, although it almost depleted the charger. If I had to guess, I'd say that the capacity is closer to 5,000 mAh than 6K.

Nitecore makes very good chargers and the carbon series powerbanks hold a special place in my bags. I bought this one which likely has a 21700 cell in it to keep in a camera bag to charge on the go

Used it once, and now it stopped charging. Battery heats up when I put it on charge and I fear it might explode or cause a fire. Charging indicator shows one light and the second one glows very faintly but doesn’t blink like it should when working normally. Avoid this .

Doesn't seem to work for what I bought it for. I bought this to stash on my motorcycle and attached it to GPS tracker so I wouldn't have to remove the tracker weekly to charge it. Neither device registers the other and actually causes the tracker to drain faster. I don't really have a use for an external battery beyond this so it was a waste of money. 3 stars because it is nicely built and I'm sure it works fine for charging a phone or something. Just doesn't work for the purpose I wanted.

Does exactly what it says on the tin

This is a great piece of kit. Compact and lightweight perfect for my EDC. It’s enough to full charge my iPhone once, more than enough to keep me going until I get somewhere with mains. The only thing not giving it 5 starts is the price point.

This is a complete and utter misleading product. It claims on the listing this is a 6000 mAh battery pack, it is not when you get it it is 3.7k mAh at 5v the voltage used to charge a phone. As this requires a step up from the native 3.6v which they claim is 6000 mAh (its not more like 5000 mAh would be my guess as its a standard cell size.) Actual real world use 2.5 mAh charge my 47-- mAh Iphone Max Pro to 54% form 3% and then ran out of power.... do the maths. Told Nitecore - uninterested came back with lotsof excuses about voltage change loss of energy through heat etc etc etc. Dont buy if your expecting a useable 6000 mAh.