BaseusPower Bank, 20000mAh 65W Metal Laptop Portable Charger, 4-Port USB C Battery Pack, PD3.0 Fast Charging Battery Bank for MacBook Dell XPS IPad iPhone 15/14/13/12 Pro Samsung S23 S22 Steam Deck

I have a 2-year degree and 4 years of experience in IT + paid attention in my electronics class in high school, so you could say I'm a certified nerd. I've only had the Baseus power bank for a few days now, but the performance is extremely solid so far and I recommend it.Chances are you're just here in the reviews to check if it's a scam. So here's the part you care about:The energy capacity is advertised as 74 watt-hours. I ran an endurance test with a load of ~10 watts (5v2a as reported by the battery) and it lasted 6 hours and 10 minutes, for a usable capacity of ~61.7 watt-hours. This is normal, all batteries lose some of their output as heat. The battery says it has an energy conversion rate of >=75%, and my unit had an energy conversion rate of ~83.3% in my testing (usable wh / battery capacity).Pros:1. The battery capacity is actually as advertised, which can be hard to come by on this platform.2. The built-in display is great for superusers. Where every battery bank I've used before just shows its charge percentage, the display can be toggled between that, amperage, and voltage - all three of which work while charging or discharging. The display is 7-segment with red LEDs at a gentle brightness.3. The build quality is great. Feels sturdy enough to use as a weapon in a pinch.4. It supports simultaneous charge/discharge, though my testing couldn't tell me how much power it provides whilst charging as I don't have the necessary equipment to measure it, and the output voltage/amps doesn't show on the display while it's charging.Cons:1. When a device is connected to or disconnected from the battery, the power is briefly stopped and restarted on all ports, causing attached devices without their own battery to shut down.2. When a connected device completely stops consuming power, the port is shut off until the device is unplugged & plugged back in, or the power button is pressed. And I do mean *completely*, even a fraction of a watt seems to be enough to keep it on. This triggers con #1 as well.So if your use case for this battery bank includes powering devices that don't contain their own battery, be aware of these caveats and have a workaround in mind. I still recommend this battery bank.In my case, I got this for an electronics project, and I was powering a Raspberry Pi 4b (USB-A) and two 64x32 LED arrays (USB-C). Whenever I'd stop sending an image to the displays, the port would shut off due to no power being consumed, and the Pi would lose power for just long enough to reboot as well. Using a USB-PD trigger board to power both the Pi and my matrices off of the same USB-C port proved an effective workaround.(Just in case this review reaches someone else trying to do a similar project, you'll want a DC buck converter as well so you can get more than 15 watts out of the USB-C port at 5 volts. I plan to add one later)

I bought this to use as a backup charger for a laptop. I also purchased a USB-C to HP-"Blue"-DC plug to complete the package.It works great, better than expected. I discharged the internal laptop battery down to 15% and then plugged in this charger. I used the laptop the entire time for various things, but keeping the screen on constantly and ran some background utilities to ensure the CPU would not drop below 50% the entire time. After 2.5 hours this charger had discharged completely, and my internal battery was charged up to 55%. I typically get around 6 hours of battery life from the internal laptop battery, so this extended that over 75% (with this test I got almost 11 hours out of it).All of that said, there are some limitations that I wish I knew ahead of time. I can't do pass-through charging with this, making it not usable as a UPS. When I have it plugged in to charge, it won't also output enough power to charge the laptop. I haven't done in-depth voltage/output checks to determine why, just the basic plugged it into the wall and plugged the USB-C into the laptop, and the charger wouldn't power the laptop. The other limitation is similar in that I couldn't power the laptop AND use the USB-A chargers at the same time. Again, nothing in depth on why yet, but I assume the output on the USB-C needs all of the juice to achieve the 65w, so any other discharge lowers that enough that the laptop isn't ok with the level of energy provided.Even after knowing both of those issues, I highly recommend this for the price and capabilities. While I certainly would like this to have more capacity, there's always a balance between size/weight and mobility with these things and this strikes a good balance for the price.

I bought this power bank on December 2023. Went to a Europe trip last June 2024 and the power bank started to give troubles. For example, I charge it to 100% and disconnect it from the wall power outlet. The next morning I wanted to use it and after connecting my Samsung Galaxy S23 Ultra to the usb C power bank's port it didn't do anything, not even the side button to check the charge worked. So I have to connect it again to the wall power outlet, it would show 100% battery charge and after that it would charge my phone. But come on, why would I use a power bank the needs a wall power outlet to iniciate its functions even tho it has 100% charge on its own? Where am I supposed to find a wall power outlet in the middle of nowhere during a day trip? It completely fails it's functionality.Now, after 9 months from usage, it just won't hold it's charge at all. Two days ago it was fully charged and just resting inside it's case. Today I was going to use it and was completely discharged!!! I pushed the side button to check the charge left and it shows 0%. Again I connect it to the wall power outlet, it reboot and started to show 70% battery left after just 3 seconds of being connected to a wall phone charger. You can see it on the attached picture, the product even have the transparent decals from being new.Power banks should not work that way. This product is expensive and won't last even a year. You better search for another brand and save your money!!I would like to see what the brand warranty policies are going to offer now...

Great value, plenty of ports, not too heavy, great battery life