NJF-5X

This power bank is an absolute powerhouse. It’s become my go-to for keeping all my devices charged, especially when traveling or working remotely. 🔋 Massive Capacity With 50000mAh, it easily charges my laptop, tablet, and phone multiple times before needing to be recharged. It’s ideal for long trips or power outages. ⚡ Customizable Voltage Output The adjustable DC output (from 5V to 20V) allows me to safely charge a wide range of devices, including laptops that require specific voltage levels. 🔌 Multiple Ports for Convenience It includes USB-A with QC3.0, a USB-C port, and a DC port, allowing me to charge several devices at once without any drop in performance. 🧳 Portable Despite the Power Though it’s high-capacity, it’s still compact enough to fit into a backpack or laptop bag. The included case is also a nice bonus for organized travel. ✅ Pros: Extremely high capacity (50000mAh) Adjustable voltage for charging different devices Multiple output ports (USB-C, USB-A QC3.0, DC) Great for travel, emergencies, or remote work Overall: The Krisdonia 50000mAh Power Bank delivers exceptional performance with flexibility and power to spare. It’s well worth the investment if you need serious backup energy for your devices. Highly recommended.

GOOD - I am very pleased and happy with this product. Krisdonia (Shenzhen Tech. Corp.) has liberated me and made me feel free to sit for hours at outdoor coffee shops and indoor mall seating by the fountain. I get my laptop battery charged plus many MORE hours from the Krisdonia. I am using an Acer Aspire 5 (A515-43-R19L). Krisdonia is a really good equipment! Operating this battery is very simple, but the directions must be followed EXACTLY for success using it. Directions say turn ON by holding down front button for 2 seconds - needs to be 3 seconds to hold down and turn ON and then one changes the voltage selection by rapidly pressing the same front button two times ("double click") and then 2 times again for the next voltage level selection until one has the correct setting for your device - I also use the Krisdonia for cell phone charging and recharging u. s. b. bicycle lights. When finished charging devices one should hold down the same front button 3 seconds to turn Krisdonia OFF. The Krisdonia is very attractive in black and elegantly minimal. The older technology of the Krisdonia makes it about 3 lbs., but that is why it is affordable. The so called "pass through" charge meaning charging the device, using the Krisdonia plugged into an outlet while simultaneously using the device, may or may NOT work. The directions say if Krisdonia automatically shuts off, then this will mean that it is telling you: "pass through" will not work. I cannot do this pass through - the light on front and the Krisdonia itself just turn off. However, I can plug the CHARGED Krisdonia into the laptop WITHOUT having the Krisdonia plugged into a wall outlet and charge the laptop WHILE using the laptop. In other words- - I have to unplug the KRISDONIA from the wall outlet before I can connect to the devices for charging them while using these devices. For those, like myself, who do not know what "voltage" means -here's a tip not to worry: if you set the voltage too low nothing will happen. It just will not go on and no electricity goes through. If you set the voltage too high, it will only put the right amount in without causing harm. In other words the higher voltage amount will be reduced to the voltage needed by the item being charged. It will not burn or explode. Incidentally, I charge my bicycle rechargeable lights and smartphone also-works fabulous! I am able to use the Krisdonia and connect it to my laptop with only one simple cord provided - real simple! Charging Krisdonia takes approx. 3-4 hours and will read out a digital % number as it charges and reaches 100%, but it can also be partially charged like if you are in a hurry possibly use it when it says 47% and then that takes about 1 more hour to reach 100%.

I’m mainly using it to power a Positive Grid Spark 40 amplifier. It works very well, but if anything, the Krisdonia is too smart for my purposes. Since the Spark is not a device being charged, the power bank doesn’t recognize it, and the 1-minute shutdown kicks in. The solution is to plug in a USB device to increase the current draw and keep the power bank on. This was recommended by many members of Spark 40 groups on FB, and also by Krisdonia themselves. A simple USB light will do. You could also charge a device via USB while powering the amplifier, but again, once the Krisdonia senses the device is fully charged, the 1-minute shutdown will occur. So for me, it’s a USB light as it requires a constant draw. While the design choice of needing to double-press the power button to cycle through the voltage choices is a very solid one, it’s a minor hassle but ensures greater accuracy than putting the voltage choices on a slider-switch, for example, which could easily be placed in the wrong position and POOF!, bad things happen! Krisdonia designed it in such a way that the user HAS to make sure it is in the correct voltage for the customer’s intended application. What would be a very nice feature would be if it could “remember” the last selected voltage output. Cycling through all the settings to get to 20V (what the Spark needs) every single time the power bank is used is a slight inconvenience. This suggestion was sent to Krisdonia, and their reply was that they would take it under consideration. Overall, highly recommended. Fast-charging, long-lasting, so far it’s been very dependable for a number of uses. Even with its shortcomings, such as having to set the correct voltage every time it’s used, and needing to bump up the draw with a USB device, again, just for my purposes regarding the amplifier, it’s no fault of the power bank’s design, I very much like it and I’ll keep it. I can use it for much more than just powering the Spark.

good external powerbank

La batterie de mon iPad était en fin de vie. La batterie externe m’a permis de prolonger son utilisation et pouvoir me déplacer avec ma tablette. Je ne pourrais plus m’en passer en voyage. Je n’ai plus à m’inquiéter du niveau de pile de mes appareils.

Battery life is amazing, it lasts so long. I’m powering my field recorder (zoom f8n) with this and I recorded for half day continuously and it still has 91% power. I also liked the items included in the package. You have a number of adopters so that you can use the power bank with almost any kind of device. In relation to power, this is the best equipment I have ever bought!

Product does not work as advertised... And mine has something loose in it. Does not charge my Dell XPS15 via usb c, does not even charge my Dell XPS13 via usb-c or usb. Doesn't even charge my power banks at high speed... Vendor expects me to pay return shipping even though the product is falsely advertised and is defective as well. Have contacted Amazon and they will deal with the vendor. Do not recommend buying anything from this vendor... Very dishonest. Amazon refunded me in full and product is going into the trash as soon as I remove the battery inside... Total junk Don't believe the reviews you see on this item.

Good product.