Krisdonia Portable Laptop Charger 185Wh/50000mAh Laptop Power Bank External Battery Pack for Laptop, Tablet, Projector, Smartphone and Others

You never know what you are getting with off-brand overseas products. This product is legit. I was not paid or compensated to leave this review.1. You press the only button on the device to turn on. It defaults to 5V, which is for USB. You click button twice quickly to move up through different voltages, with it returning to 5V after the highest 20V setting. This feature is easy to use and works.2. I tried using this to charge/run my Dell Precision 7550 and Thinkpad P1 Gen 3. These are both high end workstation laptops, the 7550 especially, which come with 185W and 135W power supplies, respectively. At the lowest power mode on the Precision 7550, power saver, in Win10, internal laptop battery lost about 1% per hour, with this external battery lasting about 3-4 hours. It was able to run the laptop the way my AC adapter does--on low power mode in Win10. I was not masochistic enough to try high performance mode. I had the same excellent result with my Thinkpad. The adapters provided with this device plugin where the AC adapter does, and the Dell (large) and rectangular Thinkpad both worked. They fit snugly in holes, but there was some metal on the adapter protruding out the adapter hole on laptop, which the native OEM Dell and Lenovo adapters do not do. This is very minor and did not bother me, though anything contacting the protruding metal would be electrified and maybe short out device. Overall, I was incredibly pleased that this battery can honestly power both my absurdly powerful workstation laptops--the Precision especially. These are 15" not 17" workstations, however. I cannot vouch for all the other connectors, but the Dell and Thinkpad worked for me at 20V setting. I did check output with meter before using, to make sure didn't fry my laptops, it was 20V. I did not have equipment to determine amp draw of the device, or my laptops, but I think the huge power adapters that ship with them are designed to allow running device full throttle (which is absurd amount of computer processing power with the 7K series precision) AND charge the battery. This device lists maximum output of 4.7A at 20V, or about 94W. This would mean if its 185WH rating is legit, it should last about 2H at maximum output. It lasted 3-4 hours, which makes me think output is about 2.5A to power my laptop. I again could not measure amp draw directly, these are guesstimates. Overall, I got this primarily to power my workstations when travelling, the manufactures used to sell external swappable batteries that clicked into system, but no longer do so most all batteries being completely internal, but this is ultimately a bit better because it allows powering multiple brands of laptops without buying batteries for both.3. I used both USB ports to power/charge a phone and tablet, simultaneously, including a Samsung Galaxy View 2, a huge tablet. If it can handle workstations, rest of stuff is easy, but just confirming that both USB-A and USB-C ports work and did not fry at least 5 different devices, it tried and powered or charged all effortlessly, including a Google phone, Samsung phone, a Google tablet, an Apple tablet, and a Samsung tablet.4. This device is large, but I didn't expect to power a precision 7K series with something tiny. It fits in the rear or front pocket of my laptop case, which is good enough for me, but I wouldn't want to be lugging it too far.5. The small cloth zipcase that comes with it fits it perfectly, with a small front pocket that I put the Dell and Thinkpad adapters in. I can fit it in my leather attache front or rear pockets even in case; though a battery this big again will never be small, this is at least designed with a profile--it is reasonably thin--that makes it as portable as possible. The case has incredibly strong chemical smell and will need to be aired out prior to use.6. The device did not grow hot while running my workstations or powering anything else.7. The digital display is easy to read. The percent left is helpful, but the time left that some higher-end devices have would be helpful. The green display is a bit old-school, like an old digital clock, a smaller grey screen with better resolution might be better, which would allow time left to be shown. It is still essential to be able to see the voltage, and the percent left is much better than just four green lights like on most devices. The display works and meets the need, but something like on Yeti Sherpa would be great.8. Minor quibble. There is no list of all adapters included in manual, nor way to know what the different adapters are with exactitude. Some have letters on side. The Dell says forDell right on adapter, but it still would be nice to at least have a diagram in manual showing closeup or list of what color or letter adapter is what. If I didn't own Dell or Lenovo, might have been some guesswork.9. The only major gripe I would have, and it is still very minor, is inability to charge it via USB. You can only use the included AC power brick, which outputs 5V DC in, to a separate port on device. If I'm travelling, carrying this becomes a real pain. I would have preferred a USB-C in, or ability to use USB-C out as in, so I can use my slim AC outlet plug that a USB plugs into in a pinch. To use the stuff I normally travel with to charge it in a pinch, in other words.10. When you consider they way American brands gouge consumers, this is an exceptional value. To take one simple example, the GZ Sherpa 100 has 94WH, about half this, and runs $300, meaning you could by 2 of these, have $60 to spare, and have four times the power of a Sherpa 100, though the Sherpa does have an AC output and a better display.11. Airlines don't allow large Lithium batteries because they can runaway thermally and cause fires that are hard to put out. One of those too big could down a plane. This company makes a smaller one that is airline TSA compliant, but I didn't want that. I wanted the biggest battery or WH I could find in something still portable to power my workstation laptops. This is it. This was quite simply the best value on a per/WH basis that still seemed legit and reliable. The larger WH version had an outlet, but was not nearly as price competitive on per/WH basis, which is unsurprising because adding another inverter not cheap.12. I did not drain device full to empty and measure total WH, so cannot vouch for total WH, but it is at least in ballpark claimed per laptop tests. I cannot speak for long-term durability of batteries, but they are all made at the same dozen or so Asian factories anyway. For just over $100, if it lasts a little less long than products 3-6 times the cost for much less WH, I'm fine with that.13. Let's be honest, everything is made in China anyway, American prosperity is coming to an end, why not just buy direct from Asia at half or a third the price, and cut out American companies that just mark everything up and gouge consumers? That's what I did and I couldn't be happier.###Updated review, 03Apr2025. I have become less satisfied with this over time. The primary reason is the lack of USB charging, which now supports 100W via USB-C. Devices like this with specialized chargers rather than USB-C are legacy. This still holds charge fantastic, without latent, passive, self discharge of fancier trendy devices like Anker, Ugreen, etc. I can put it on shelf, pick it up 2 months later, 98% charge. Devices like the Anker 737 or Ugreen seem to discharge rapidly passively, which isn't problem day to day use, but more problematic if you don't want to charge it every few weeks. Most devices like this only provide usable capacity of about 60% of rated, this is no different, but it has maintained that capacity over time with modest but not heavy use. So years later, batteries still going strong, but I simply cannot recommend this device with its antiquated need for separate DC charger, and its lack of support for 100W usb-c output without a special cable, to run laptops. The need for specialized input and output cables to utilize higher power makes this a legacy device I would pass on, despite the good quality.

You do not want to carry this around with you regularly. It's quite a chonker, but it has a good set of outlets and a lot of power. It can power your laptop or any other electrical device within reason.It's an external battery for your laptop, even a light-duty gaming laptop (but only for a limited amount of time). It will supply 100W of power in total and supposedly has 100W PD output, but I don't have any device that needs that, so I can't test it.It's good to power a CPAP machine as a backup power source if your power goes out (which is what I got it for), but you can use it to charge your phones at the same time, which is great.Highly recommended. You do not want to carry this around with you regularly. It's quite a chonker, but it has a good set of outlets and a lot of power. It can power your laptop or any other electrical device within reason.It's an external battery for your laptop, even a light-duty gaming laptop (but only for a limited amount of time). It will supply 100W of power in total and supposedly has 100W PD output, but I don't have any device that needs that, so I can't test it.It's good to power a CPAP machine as a backup power source if your power goes out (which is what I got it for), but you can use it to charge your phones at the same time, which is great.Highly recommended.

Purchased in April 2025. Whenever I change the DC Out voltage, it remembers the last setting. I read several older reviews that said voltage always goes by to default after powering off. I suppose the one I received a newer version that saves the last voltage setting. I use 12V and for the last couple weeks, it has remained at 12V.One more tip - mine came charged to 95% so I used it immediately to charge some devices. I saw the percentage drop very quickly to where I doubted the rated mAH. However, the instructions say charge to 100% before first use so I did. Once fully charged, I started to charge my devices and this time the percentage drop was much slower and my back of the envelope math came out to about 48K mAH so the product specs appear legit. This requires a full charge to calibrate the power indicator.Last test I did was to keep the power bank off for a full week. When I turned it back on, it was still at the percentage when I turned it off.So far, I am very happy with the price, features, and performance. Hopefully this will last several years.

If you’re looking for a great power bank that doesn’t break the bank then this is it! It holds the voltage you have set for each use. It’s great for traveling or if you’re working on the road. Or even if you just want to work outside for the day. I never have to worry about my laptop losing power no matter where I am. It actually came in handy recently when we had a storm and the power went out but my laptop stayed going all night. It’s a clean look and comes with a carrying case as well as adapters. It works really well for all my needs.