Anker has done it again by putting another great product out there!! I finally did the test I was waiting for 😁 This baby charges pretty quick no matter what percentage its on......mine was at 16% & it only took 1.5 hrs to charge back to 100%, that was car charging, awesome!! Performance is flawless 👍 I've charged my phone numerous times, my tablet, even my portable solar chargers (2) & my usb portable fans, this box lasted 4 whole days on 1 charge 😁 Portability is great & lightweight, looks heavy but it's not! It's a great little box that gives you plenty of uses which has 2 usb ports, 1 c port, has 2 outlet plugs, 1 car socket which works very fast!! I got it for $200, very good value for the money. You can take this box anywhere you need charging, has eco mode, very bright light.....Overall I'm extremely happy w/this charger, money well spent 😁 THANK YOU ANKER for another great product you've made, I have several of your products & I ❤️ them all....Job well done on this box!!! I HIGHLY recommend especially to the campers & hikers, it won't disappoint you!!!

I bought this as an auxiliary power source for use in a vehicle--I need to carry a 12 volt refrigerator with me (special dietary needs, road food, etc.), and occasionally charge up Milwaukee tool or DSLR batteries even if the vehicle is not running. The packaging of the 521 is ideal, although I wish the two 120V outlets had "real" 3-prong outlets. The size is perfect when a vehicle is loaded up--it uses little space. I ran two tests with the refrigerator connected to the 12 volt outlet. The refrigerator operates in both ECO and MAX modes. The ECO mode draws 30-35 watts while operating, while the MAX runs at anywhere from 40-50 watts. I ran the refrigerator indoors somewhat near a heat outlet, to simulate being inside a warm vehicle. The refrigerator is rated to deliver 256Wh of power, so I calculated that worst case would be the refrigerator running constantly for 5.5 hours. Turns out that with the refrigerator cycling on and off, it ran over 20 hours before the battery was down to about 2-4% capacity. EDIT: I had a charging issue that was partly my own misunderstanding and partly my car's wiring. I was at first unsuccessful in getting the 521 to charge from both inputs. First, I had to use a USB-C PD charger, which provides higher voltages than standard USB chargers. This allowed a full 65 watts on the USB-C input for charging. But I would add the 120 volt charger that came with the 521 in tandem with the USB-C charger wasn't getting the ~120 watts of charging. I later realized that for battery health, the 120 watt charging through both DC inputs only happens when the battery's state of charge is lower. If it's nearly fully charged, it cuts back to only a single DC input. Yet, I still could not get both to work in the car. I have a 150 watt 120-volt inverter in the car, which plugs into a rear accessory outlet using a lighter plug. It turns out that if I have both the 521's 120 volt charger and a USB-C PD charger plugged into the inverter, the inverter stops working. Likewise, if I use a separate USB-C charger that plugs into the accessory outlet (I have a 1:3 adapter with a voltage readout), the inverter cuts out. It seems the inverter is cutting out when voltage drops below a nominal value like 12.8 volts. In essence, the wiring from the fuse box to the accessory outlet cannot provide full wattage without voltage sag. When I plug the USB-C PD adapter into an accessory outlet in the center console (which is on its own 15 amp circuit), I can get 120 watts of charging to the 521. I will wire up my own circuit with 6-gauge wire to run a 300 or 400 watt inverter and a pair of accessory outlets, as this will eliminate the voltage drop. With ~120 watts, this provides a quicker recovery for the battery while the refrigerator is operating, which is exactly what I needed.

I purchased this specifically to run an Airmini CPAP while camping, and I desired 2 nights of capacity. I don’t review many products, but because this one matched up with my camping CPAP needs perfectly, decided to write one. My testing at home, using the regular Airmini AC adapter (not the DC adapter for Airmini, I haven’t bought one of those yet) resulted in 66% of charge left after one 8 hour night of use. My CPAP pressure is between 8 and 9. I recently used the Anker 521 for two nights while camping, again with the standard AC Airmini adapter. I used the built in light for about 10 mins, but didn’t charge any phones or other devices. I only plugged in the AC adapter when I was going to use the Airmini, and unplugged it when I got up in the morning. The first night was 6hrs 45 min of Airmini CPAP use, the second night 9 hours 20 min. After both nights, the charge was 38%. The temp the first night was in the high 20s F, and the second night, low 30s F. So I didn’t experience any loss of capacity due to the lower temperatures than my at home testing. Right now I’m very pleased with the Anker box. Next trip I will use the built in light longer and probably charge my phone a few times. Things I really like about the Anker 521, and why I chose it for my Airmini power supply: Can turn on or off different sections of the power box, to save power when not using the other types of power (12v, USB, AC, etc) Has a trickle charge (regular) and eco mode (my terms, can’t remember the actual Anker terms) for power output modes. In regular, even if your device doesn’t draw much power, the Anker stays on. I wanted this, as many battery boxes would turn off after 3-4 hours because someone’s CPAP didn’t draw enough current, and the battery box then turned off. I wanted it on, when I told it to be on! LiFePo4 battery is supposedly safer than standard Li batteries. Built in light was plenty to see inside my tent. Weight and size I considered to be great given the power output. I believe the unit can be plugged into the wall and also powering devices, performing like an UPS. I don’t need this currently, so didn’t test it, so can’t say for sure. Cons: none yet! I’d love to try this with a solar panel, but don’t have one yet. Conclusion: I’d buy it again!

I recently purchased the Anker Portable Power Station, and I am thoroughly impressed with its performance. As someone who frequently camps and goes on outdoor adventures, having a reliable power source is crucial. This power station has exceeded my expectations in every way. Key Features: High Capacity: With a 256Wh capacity, this power station can charge my phone multiple times, power my laptop, and even run small appliances like a mini fridge for several hours. It's perfect for extended trips off the grid. Multiple Outputs: The variety of charging options (AC outlet, USB-A, USB-C, and DC car port) is fantastic. I can charge everything from my smartphone to my drone to my laptop without any issues. Compact & Portable: The design is sleek and portable, and at just under 7 lbs, it's easy to carry in a backpack or store in my car. It’s also surprisingly quiet when in use—no loud fan noise like some other power stations I’ve used. Fast Charging: I was amazed at how quickly this power station charges both itself and devices. It’s perfect for quickly topping off my devices between outings or after a long day. Solid Build Quality: The Anker brand has a reputation for quality, and this power station definitely lives up to it. It feels sturdy and well-made, with a durable outer shell that gives me confidence it’ll hold up over time. Cons: The price is a bit higher compared to some other options on the market, but in my opinion, it’s worth it for the reliability, efficiency, and convenience it offers. It could benefit from a higher power output if you plan to use larger appliances, but for most everyday electronics, it does the job perfectly. Overall, I highly recommend the Anker Portable Power Station to anyone looking for a dependable and efficient power solution while on the go. Whether you're heading out for a camping trip, road trip, or just need a backup power source for emergencies, this power station has you covered!

Smaller than i thought but powerful. I use its car charger adapter to power tools when doing tire changing last week and worked flawlessly. Recommend

Still early but so far, so good. Powers my cpap for 2 nights. Built in nite-lite is handy. It can accept 3 prong AC plugs. Well priced.

The Anker 521 Portable Power Station is a reliable companion for outdoor activities like camping and field trips. I used it to charge batteries and power a covering iron while flying air models in the field, and it worked flawlessly. Paired with a 100W solar panel, it recharges efficiently, making it a great portable power source. Highly recommended for anyone needing dependable off-grid power for light to moderate usage!

Works great, used during my power outage, make sure to leave it on power saving mode for storage or else it will drain over time!