ROMOSS Power Bank, 40,000mAh 65W Portable Laptop Charger with USB C Fast Charging, External Battery Pack Compatible with MacBook Pro/Air, Dell XPS, iPad, iPhone 15, Samsung, Tablet, Steam Deck
Original price was: $64.99.$61.74Current price is: $61.74.
Price: $64.99 - $61.74
(as of Jan 20, 2025 15:20:18 UTC – Details)
Product Description
Why is my power bank providing fewer charges than expected?
The capacity reduction during charging is due to a 30% to 45% energy loss in the battery cells and conversion circuitry. Therefore, a fully charged Romoss Power Bank offers an estimated 2200mAh to 28000mAh to power devices.
Is it normal for the power bank to get slightly warm during use?
Slight heating due to efficiency losses in the conversion circuit is normal. The temperature of this Romoss Power Bank meets the temperature limits of the IEC62368 certification standard.
Why does the battery drain so quickly?
When the Settings selection screen is always on, both the screen and MCU are working, so it is normal that the battery drains quickly.It uses 15% of the battery in about 24 hours. We recommend turning off the display screen when not in use.
Why does charging stop at 80%?
Your iPhone may automatically stop charging at 80% to protect its battery from overheating, as part of iOS 17’s thermal management strategy. Charging will resume once the device cools down. Moving it to a cooler spot can help speed up this process.
How can I keep my power bank in the best possible condition?
Charge your power bank regularly. Even if you don’t use the power bank for a long time, remember to charge it every six months to keep the battery level around 50%. This is because power banks can discharge even when not in use.
65W Fast Charging: Our power bank boasts a 65W USB-C port, compatible with most fast charging protocols, capable of charging laptops. Charge a MacBook Pro to 41% in just 30mins, keeping your devices powered up for all-day connectivity and efficient work.
3 Outputs + 3 Inputs: Our power bank features three output ports (USB-C, USB-A *2) and three input ports (Micro, Lightning, USB-C), enabling simultaneous charging of up to three devices. Ideal for families, friends, or anyone with multiple devices.
Wide Device Compatibility: Whether you’re using a laptop, smartphone, tablet, smartwatch, or other electronic devices, our power bank is compatible with a wide range of devices.
Massive capacity: With an impressive 40000mAh capacity, you’ll have ample power to keep your devices running for extended periods, whether you’re traveling, working, or exploring.
Safety guaranteed: Our power bank undergoes rigorous safety testing and certifications, ensuring reliable and worry-free charging for you and your devices.
What’s Included: ROMOSS 40000mAh power bank, 3.28ft/1m charging cable, user manual. Note: You may receive either a USB-C to USB-C or a USB-C to USB-A charging cable.
13 reviews for ROMOSS Power Bank, 40,000mAh 65W Portable Laptop Charger with USB C Fast Charging, External Battery Pack Compatible with MacBook Pro/Air, Dell XPS, iPad, iPhone 15, Samsung, Tablet, Steam Deck
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Original price was: $64.99.$61.74Current price is: $61.74.
Kevin S. –
After two years, I decided to get another one
I purchased this right in the spring of 2020 and itâs still going strong! Itâs literally charging my iPhone right now via usb- C.UPDATE 12/22/2022: I got another one!Amazon won’t let me make two reviews, so I am updating my original review. I first purchased this battery bank on 03/09/2020 and now, nearly three years later, I saw that this was on a 40% off sale, so I HAD to jump on that. This battery has been dependable, reliable, consistent, steady, stable, trustworthy, steadfast, unwavering, and…… reliable haha.You can see two years of wear and tear between the two in my attached photos, and I am extremely pleased with this brand and the quality of this battery. I don’t even charge my phone from the wall anymore. I just charge this battery and charge my phone from it. Having two now will make that very useful. Just one of these is enough to charge my iPhone 13 Pro Max 9 full times from dead with a little bit of power left, as my phone has a 4,352mAh battery. With the fast charging, I couldn’t imagine needing a different one. The 60,000mAh ROMOSS model was very enticing, but this was 40% off so this one is the winner.I’m not at all affiliated with the seller or brand, I just want to share my surprisingly excellent experience with you all. This is the battery bank to have if you want some charging insurance through power outages or if you, like me, like to play full controller games on your phone (it’s call of duty mobile for me) for hours and hour and hours on end and need a portable, convenient power bank. These guys charge at a rate of 18w (9v 2A) via usb C and at 10W via micro-USB. I always opt for fast charging, as a battery of this capacity takes quite a while to charge. It takes a solid 8-9 hours to fast charge these from dead to full, and around 13-14 hours if you don’t have a USB C charger. They take days of use before they die, though. Now that I have two, that’s a problem of the past. Just recently, my IMUTO 30,000mAh power bank stopped charging through its only input, so I’m glad to have found this one on a sale! I paid full price the first time around and I would have done it again too.Anyways, 10/10. Absolutely recommend. I’ve never had any issues whatsoever with mine in nearly three years. All of the ports still work, the capacity is undoubtedly lower because batteries aren’t immortal, but it still keeps a very solid charge after hundreds of charge and discharge cycles. I can still charge my phone and Apple Watch around 8 times each, maybe a little bit less. So don’t worry about whether or not it will continue to work for you!I will update this review again if ever necessary.
Test_Engineer –
High capacity
This can easily charge my iPhone pro max maybe 8 times before needing to be recharged. It charges fast and the lcd display adds a nice touch. There are a lot of ports on this and itâs shaped like a small brick. Not sure how durable it is if dropped. Wish it came with a protective carry bag or something to protect it.
TD Bowen –
Works great but picture is not actual size.
The unit works great. It charged my power hungry laptop while I was working on it and all my other smaller devices as fast as the wall chargers. It is bigger than it looks in the pictures and it is heavy. This is not a pocket power source. Pay attention to the dimensions if you plan to take this along in a computer bag or carry on. I would recommend this because of its performance but suggest checking with any airline before trying to put it in checked bags.
C. O. –
Good overall solution when looking for large battery power capacity
This unit takes forever to charge (12 hours plus from a zero state) when using a standard usb connection. I haven’t had the opportunity to use a USB-C connector with more amperage, but still guessing something around 6-8 hours might be required. The first charge only showed 99%, no matter how long it sat charging. I used the 99% on a small fan we run in a cabin to circulate air. Ran the fan about 32 hours before it hit zero. That’s about 4x the smaller standard battery chargers I have around the house. It is heavy, so not great for travelling, but if you need a big charge, it may be worth it. Second charge on this unit showed 100%.Just a heads-up….this seems to stay on 100 or 99% for about half the battery life, then decreases somewhat rapidly from there. May just be my charger, but it’s hard to know how much charge you have once you start to use a full charge.
KLM –
18 Watt Power Delivery (PD) is Accurate!
I bought this to power my Meta Quest 3 VR headset. I’ve been wanting something that truly allowed my headset to draw 18 Watts. This battery does just that! After a two-hour session on Automobilista 2 (racing sim), My headset battery went from 100% to 98%, and the ROMOSS 40000mwh battery went from 100% to 85%. Are there cons? Well, it’s heavy, but what do you expect for 40000mwh battery? The charger it comes with charges fine, but seems slow. This isn’t a show stopper, because you can charge overnight, and use it practically all day. If it can handle a VR headset this well, I am sure it can handle pretty much any device you want to supply battery power. Cables are important. Do your research! I am using the Fasgear USB C to USB C Cable 10ft Right Angle 90 Degree 100W 5A PD.
Diana –
Great for charging up phones even while driving. Saves gas when you’re not charging thru the car.
Charging up phones while driving. After a week it still had 22% left. It is big and it is heavy, but it works, and holds a lot of charge, so perfect for the car, home or anywhere you need extra power. Probably too heavy for backpacking. I drove from Colorado to Eastern Canada and back and mostly charged my phone with it. So about a week and a half with my phone plugged into it with heavy use on my phone like google directions, gas prices, etc. I used this instead of my car for charging to save on gas. I think it’s less drag on my alternator. I’d say for the price, this is an excellent value.
Jay –
DON’T BUY! and why can’t I change from 5 Star to one!?!?!!
I bought this item as an emergency backup battery. I’ve used it maybe nine times and it’s already malfunctioning/ not charging my Samsung S24 ultra. This thing is garbage!
Bob –
TSA confiscated
Love this battery and took it on four flights but TSA finally confiscated it at the Philadelphia International Airport. They said United airline only allows 100w or less on plane. They said this battery needs to be checked into luggage. :/ really sucks cuz it powers my kids iPad for hours. Canât recommend for flights. :/
Mario –
Die Powerbank ist wirklich gut. Leistung Satt!!!! Für Unterwegs in die Hosentasche stecken ist nicht 🙂 zu gross und zu zuschwer. aber für Rucksack oder zum Laden im Auto kein problem.
Ben –
Vider entièrement la première fois.Il mâa fallut du temps. Reçue à 78% :o)Jâai mesuré les mAh utilisés pour sa charge complète 34224mAh. Je suppose que mon testeur a aussi sa tolérance⦠donc super satisfait de la véracité des informations annoncées. Câest la vérité.Je revaliderai la capacité lors de sa prochaine recharge.. il faudra du temps.usb-a et usb-c, (5-9-12V avec 3-2-1.5A)Sortie vérifiées.Double clic sur le bouton action permet de forcer le power on (empêche lâauto poweroff en cas de non ou trop basse consommation.Super je recommande.
dario e veronica –
La marca che non avevo mai sentito ho voluto testarlo . Dura davvero tanto ha un bel peso ma a me non importa per il mio utilizzo in casa carico anche 4 cell insieme in caso di mancata corrente e perfetto poi io lo ricarico con un pannello solare diventa energia green
Manuel Dominguez –
En general muy satisfecho con el producto, ta un amplio margen de uso con la dashcam, con la que frecuentemente la uso en modo vigilancia o para cargar dispositivos.La única pega, que el tiempo para cargarla es muy elevado, eso que la estoy cargando con un cargador potente de 120 W.
Giovanni Grisotti –
Sono stati squisiti nel sostituirmi il prodotto, che per quanto robusto e potente di ricarica, era troppo pesante per me.