• expired

Romoss USB-PD & QC 3.0 18W 40000mAh Power Bank $49.49, 20000mAh $26.24 + Delivery ($0 with Prime/ $39 Spend) @ Romoss Amazon AU


More power banks on sale and this time we have a massive one that has a whopping capacity of 40000mAh! An excellent choice if you're like me and like to go camping away from powered sites where a power bank becomes essential.

Also on sale is a 30000mAh, two 20000mAh and 10000mAh power banks. All power banks besides the 10000mAh have 18W USB Power Delivery and Qualcomm Quick Charge 3.0 fast charging. Some power banks have a digital display that shows the capacity, current and voltage levels. Please check the individual listings to see the features of each.

AU stock and free shipping with Prime (or orders over $39).

Price History at C CamelCamelCamel.

Related Stores

Amazon AU
Amazon AU
Romoss AU Direct
Romoss AU Direct

closed Comments

  • +11

    Far out this one isn't on sale but look at the SIZE of it. https://www.amazon.com.au/dp/B094D1V43L

    • +4

      Looks like a size of a brick.

      • +8

        Mate, it's certainly a Big Black C..harger!

      • +1

        Brik b phat doe

        I like my chargers like I enjoy women

        Lethal when falling on top of me

      • +1

        Literal power brick.

      • +1

        16h to full charge jeez thats lame. 18 watt charging only.

    • +17

      I'd probably do a deal if there was demand since it can do 5V/4A and 4.5V/5A fast charging.

      • +4

        I am interested

        • +9

          Sweet. I'll check with Romoss but it'll likely be a deal for next month.

      • I’m definitely keen

      • Yes keen !

      • I'm interested as well

    • +1

      Fast Charging not Suitable for Samsung?

      • Probably because Samsung uses PPS which is a sort of substandard of PD in layman's terms. PPS chargers/powerbanks are PD chargers but not all PD chargers like this one support PPS.

      • Seems weird to me too. I'm pretty sure Samsung's "fast charge" is just a rebranded QC 2.0 and this apparently supports QC 3.0

        • With the S20 series Samsung have changed to USB Power Delivery 3.0 with PPS. Samsung Super Fast Charging pulls 25W and Super Fast Charging 2.0 pulls 45W.

          Later versions of Android require that fast charging uses USB Power Delivery. That's why QC 4+ is seen less commonly these days but it is backwards compatible with USB-PD.

          • @Clear: Oh, I didn't realise that is what it is referring to. So it can quick charge samsung phones, just not s20 and newer? (or basically any samsung phone that doesnt support 25w and higher)

            I suppose it is always better to under promise rather than over promise!

            • @Butt Scratcher: Yes that's correct. Samsung decided to make PPS a requirement too so any old USB-PD charger won't work with Super Fast Charge. You also need to ensure the cable has an "e-mark chip" for it to work. Typically any cable advertising 100W 5A charging will be e-marked.

    • +2

      Capacity >30Ah would exceed the 100Wh limit to board planes.
      (I mean when one day the pandemic is over)

    • oh lawd she's t h i c c

    • 40,000 mAh — 0.91 kg
      60,000 mAh — 1.52 kg !

  • +2

    Had to return one of these (26800mAh model), it would run from fully charged to flat in 30 minutes and only boost my iPad by like 5%. Not sure what was wrong with it but Amazon dealt with it.

    • I have the same model. Had to return one because the USB-C stopped working. They replaced it and eventually the replacement has the exact same problem. Outside of the replacement period now.

      • +2

        Amazon's replacement periods never really end. Contact support.

  • +3

    I've been using a 30Ah model from this brand and it has charged lots of my friends phones and had plenty left for mine when camping.

  • +6

    I just bought this 45w PD 20000mah Romoss unit. However, only one input which is the usb c. Same port is also PD output, so can't passthrough charge while charging PD. Good solid unit though.

    Currently $10 off coupon via checkbox.


    • +1

      Thanks, bought this one instead for the 45W PD output. 18W is a bit "weak" for the listed ones.

    • +1

      iirc, 45w is enough to charge a mac book air.

  • Anybody tried this on a nintendo switch?

    • Yes but it won't do be suitable for dock mode.

  • +1

    Using my Honey extension, it seems 2 of these products were slightly cheaper within the last 30 days?

    20000mAh Sense 6+ reads $24.74
    30000mAh Sense 8+ reads $32.99

    The rest seem to be the same price as before but yeah just pointing that out.

    • +1

      Yes a slight price increase this time round but I've been able to get the 40000mAh lower than what it would have originally sold for.

  • Wish if the 10k did QC 3.0 or 18W

  • So yup the 40k mAh is bollocks:

    1.0 out of 5 stars Please read this before buying
    Reviewed in the United States on April 11, 2021
    Verified Purchase
    So I purchased this item thinking this battery power bank was a 40kmah, yup its not. So I did get ahold of someone from romoss to explain why the label on this product states 40kmah power bank but its not. So the catch with this product is it has 4 batteries but they are rated at 3.7v at 10kmah. So since most electronic devices need a minimum of 5v. They capacity they are stating is misleading. This power bank battery is 3.7v rated but charges at 5v which downsizes the capacity. So this power bank capacity is 20kmah at 5v rated. So beware buying this product."

    • +14

      That's actually industry standard, not a secret at all and every power bank does it. The battery cells are rated at 3.7V and 40000mAh - which is correct.

      Phone batteries however are rated at 5V so a conversion needs to be done. You'll also need to factor conversion loss but I won't include that in the formula to keep it simple.

      3.7 x 40000 / 5 = 29600mAh.

      • When you don't state anywhere on the product page what the battery voltage is when you give the capacity in mah - its misleading. They should list it like this:


        "Rate Capacity (Output):14000mAh (5V 6A)"

        Not all consumers are aware of industry standards/ 5V vs 3.7V, as the 50 odd people who found that review helpful on amazon should tell you.

        • +1

          I mean, yes maybe the seller should inform people, but this is also a case of an standard thing for power banks. All power banks - even ones from mored well known brands stocked in jb hi Fi - have this same measurement system as far as capacity. I think it's stupid. Battery capacity should be in watt hours, not milliamp hours, but somehow phones and battery packs have standardised on maH and not the superior WH, despite that being standard for measuring laptop batteries. Yes this is not a good thing but at the same time literally every battery bank on the market uses maH.

          • @deafmute: Even WH can change for a given power bank/laptop battery though. It depends on the load. A battery will deliver less power under high drain vs low drain. You might get close to rated capacity at a low discharge rate, but if it's got all ports maxed out then you won't.

        • +4

          "Mislead" has a very particular meaning

    • +5

      That's why I always look for watt/hours. There's no mistaking anything then.

    • +3

      It's pretty normal and I wouldn't say it's misleading, because that's how it is stored in the power bank.You will sometimes see them at 3.5-3.6v too.

      Not all devices have 5v batteries either, like laptops and tablets. Are phone batteries even rated at 5.0v? I know my note 4 had 3.x volts. So it isn't anymore helpful to pick another voltage. Which is why Wh is a much more useful metric imo.

      Though I will say that they should show the batteries voltage if they are going to give the capacity in mah

    • +3

      "40kmAh" hurts my brain to read, why not just say 40Ah

      • Nothing wrong with 40 kilometre-Ampere-hours…

  • +1

    definitely need something like this if you live where i live, power outages in winter are annoying as (profanity)

  • +1

    Can you bring the 40000mAh on airplanes?

    • It might be seen as a weapon to knock someone out.

      on a serious note, I recall seeing powerbank with 30k onwards will not be allowed onboard certain airlines, unless you have an exemption (best to call airline beforehand)

    • no
      26800mAh in those is the max for most airliners

    • No. They have a limit of 100Wh of energy in the cells.

      Most battery packs are rated on 3.74V cells, so 100/3.74 ~= 26,500mAh max.

    • In Australia, you are supposed to send them an email, and they will give you permission.

  • Hi Guys

    Just to be sure before i buy this would be able to charge any laptop (Asus in my case) as the compatibility shows with macbook pro and surface pro.

  • -1

    Would the 40000ah charge a Dell XPS? And if so, how long would it last, roughly.

  • Thinking of getting one to run my camping fridge, has anyone seen a female cigarette socket adaptor for these?

    • Is your fridge 12v? It might be better to use a power tool battery i've seen a few people do this.

  • For the sense4 mini can you charge the power bank while using it to charge phone at the same time?

  • What do you use the 4000 for? Wait until you have an outage that lasts for a few days?

    • Bigger is sometimes just more convenient with getting multiple charges out to one device before needing to charge the power bank itself.

  • Do these support Samsung fast charge (s10e)? I have a romoss 20000mah powerbank I bought quite some time ago and that one doesn't.

  • what is the practical difference between the 20,000mAh Sense6+ and the LT20PS+?

    is it just the USB-A port arrangement and numeric charge indicator vs a few LEDs? I've looked at the specs and feel like I must be missing something, different cell types inside?

    • LT20PS+ has the display and besides appearance they're identical. Both 20000mAh 18W power banks with the same ports.

  • how do you guys get it to ship to Australia ? I got an error saying "This item cannot be shipped to your selected delivery location. Please choose a different delivery location."

    • +1

      It's fulfilled by Amazon so it's in their Sydney warehouse. What state are you in?

      • turns out parcel locker issue lol

    • +1

      I had to change delivery from my parcel locker to home address.
      Had to do it for a few items recently, for some reason won't ship to parcel lockers.

      • +1

        Amazon don't use Auspost for delivery so that's why you can't deliver to Parcel Lockers.

        • I've had heaps of stuff delivered to parcel lockers from Amazon, and waiting in another order now from Amazon with Aus post. Only recently have they started using different carriers for me.

  • 40Ah would be perfect for dashcam parking mode, if only it could tolerate the heat in summer.

  • +1

    I bought the 40000mah version one from ebay. The size and weight is definitely not suitable for daily carry in your bag. It's 18w but it will revert to 10w or lower when you charge two devices at the same time. I saw Romoss has another version of 40000mah which has 22.5w but is not available in Australia yet. I bought this power bank just for charging some old devices which are all capped under 18w. Initially I thought that the power bank can charge at 18w even with two devices but I was wrong. But it feels good in your hands in case that you need a big brick in your bag for your personal protection.

  • This is another level :) https://www.amazon.com.au/dp/B094D1V43L/ref=emc_b_5_i 60000mah.

  • Bought the Sense8+ October last year and it failed completely first week of July this year.

    Contacted Romoss - got nothing two weeks later and when I tried again this morning their web site cert is expired and I can't even get in to their web site.

    So I contacted Amazon and within an hour my money was refunded to my credit card.

    I just ordered a replacement from this post :)

  • So I just bought the Oppo Find X2 Pro and it has this description for the charging..

    65W SuperVOOC 2.0 Flash Charging

    Will the 40000 Romoss charge it fast and is it compatible?

    Don't really know much about this sort of stuff..

    Thanks in advance

    • +1

      The maximum input charging speed of the 40000 mah is 18w.

  • LoL just reading some of the posts here.

    Seems we're finally moving towards a standard charging connector (USB-C unless you're Apple)

    But now manufacturers are building proprietary FAST charging standards into their devices.

    I mean revision 3.1 of USB-PD can handle up to 240W, but hey why use a usb.org standard when we can again get people to buy chargers specifically from us. Oh and we're not going to include them now either. They're extra.

    I'm OK with QC as well, but hey, let's not use that either.

    I thought this last year was going to make our lives better:


    But seems we've found a way to loophole that one :)

  • Can this charge my Tesla?

  • Is there even a 10000mah model that supports all the features of the 20000 ones? USB-PD and USB C etc? 20000 is too big to carry around for me.

  • Bought a LT20PS+ but unfortunately it arrived faulty - the capacity would be lucky to be 1/4 of the rated 20000mAh. Seems to be a relatively common occurrence having a skim of the reviews.

    • Sometimes they need to be drained and recharged a couple of times.

  • this 20000 model also on sale but with LCD battery level read out ROMOSS 20000mAh Type-C PD 18W https://www.amazon.com.au/dp/B07TYW7YZ4/ref=cm_sw_r_apan_glt...

Login or Join to leave a comment