Portable Power Station, 300W 220Wh Pure Sine Wave Battery Generator Inverter Power Charger Lithium Battery Packs with 110V AC Outlet 12V DC USB for Outdoors Camping Fishing CPAP Emergency

I purchased this power bank a few days ago. I never purchased a power bank before rated at such a high power level, not to mention the purchase price. I was so impressed with it, I wanted to post a review for it.The GrantMaya power bank appears to be very well made and compact. Although it's less than eight inches tall and less than eight inches wide, it does weigh about five pounds. It should be noted the bulk of the weight is due to the super powerful Lithium Ion 18650 cells the battery pack is comprised of. Yes, there are 27 INR18650, 3.6 volt, 2.2 Ah cells that produce a GROSS battery output of 59,400mAh's of power. That's an amazing amount of power, and I can tell you, GrantMaya's description of this power bank is completely accurate, which was great to see.I don't have equipment to fully confirm the output is truely pure sine wave as advertised, but I did use it to recharge my MacBook Pro 15, using the Macbooks A/C power pack plugged into the power bank. The Macbook battery was at 35% charge, and the power bank fully charged it within about 90 minutes with no problem at all. I did have my "Kill A Watt" power meter plugged into the powerbank and the Macbook Pro A/C power pack plugged into the "Kill A Watt" meter. The entire time charging, the output of the power bank remained exactly at 60 Hz, and and the voltage output varied from 112v-115v throughout the charge cycle. As far as I can see, the A/C output is pure sine wave.I also recharged my iPhone 6 Plus after charging the MacBook Pro using one of the USB outputs. The power bank seemed to stop charging after the phone reached 97%. I was monitering the USB output with a meter while the iPhone was charging. As the iPhone was nearly fully charged at 97%, the amp draw was only about .45 amps, so perhaps only drawing less than half an amp of power was to low for the power bank to detect there was a USB device attached to it. However, I did turn the power bank back on, it re-detected the iPhone, then proceeded to fully charge it the remaining 3% to fully charge it and there were no other issues.It also charged my iPad Second Generation from 14% to fully charged within a couple of hours, again using one of the USB outputs. It took a while to recharge the iPad due to the fact the iPad would only allow no more than a charging rate of 1.5 amps input. The power bank did a fantastic job.After all this charging, the power bank still showed 3 LED lights for remaining battery capacity, which seems to be 75% remaining power. Although, I can't determine the accuracy of the battery gauge, I was still very impressed.Thank you GrantMaya for producing a great power bank with true output capabilities.

This beast of a battery was essential to making my VR gaming backpack run at full speed. Basically, I needed a (relatively) lightweight battery pack that can power my Alienware M17 with an RTX 2070 graphics card at full workload when mounted on a backpack, and this thing works amazingly. Not only is the battery light enough to be carried in the backpack, but it’s powerful enough to run the computer at full speed even when playing extremely demanding titles such as Asgard’s Wrath. The battery only lasts about 45 minutes when playing such games, but that’s actually about the same battery life as any VR backpack computer on the market. In fact, I’ll probably end up buying another pack so that I can swap them out for double the play time. If you’re thinking of doing something similar, you better buy one of these bad boys soon because the price has been going up.

I have had this power bank for a few months now, and it has done exactly what i need it to do.For the price i think it could come with 1 or two other accessories, like a car charger or a properly padded bag to carry it in, but these are minor complaints for the convenience of doing what i needed it to do which is power a mixer + router+ Bluetooth receiver in remote locations like beaches and farms with no power outlets. I have used it a handful of times and run the listed items for at least 30-45 minutes at a time and the bank hasn't dropped below 3/4.Solid buy.

This is a great portable AC battery pack. I use it to run a small electric motor in key cutting machine. It so good that I am looking to purchase another and I am disappointed that they're not available.

I bought this power bank to use during power outages so I could have lights and be able to charge devices. Now I use it every day to keep my electric bill down.

Unit failed to work when first trying to use it during a power outage. Sent seller video proving it didn't work Seller wants to send a replacement USED one rather than a refund or a new item that I paid for. Feels like getting scammed. Pad for a new one, not a used one. Who knows what condition a used one would be. DIdn't pay for used, paid the price for new. Beware this seller!Edited to add: tried to use during a power outage last night. 4 Blue lights, but nothing when not on charge. Not one single thing on this worked. No blue lights, no USB or AC would work. Seller offer refund or replacement? Liked the size and design, but no good if it doesn't work.Unit has been charging for over 24 hours now. The green AC light has never come on. Unplugged power cord, and tried a small radio in the AC plug. Nothing. The 2 AC plugs do not seem to work. The USB plug in does work. Is the unit defective? From what was written the green AC light should automatically come on when fully charged. Suggestions? any way to activate the AC plugs and green light? Or just defective?20 plus hours and charged cell phone several times.Edited to add: charged for another 48 hours and it worked perfectly. Ran a transistor for 20 plus hours and charged cell phone several times.

This is a great little device for powering small devices during a power outage if you don't have a generator or don't want to run a generator just to charge devices and have lights and TV. It has enough capacity to power a TV, my heated throw, and a lamp, and charge my devices. I run the generator when I need more capacity, but this is silent whereas the generator makes noise. Small size makes it easy to carry around and store.