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ROMOSS Type-C USB PD & QC 3.0 18W 30000mAh Power Bank $28.39, 20000mAh $22.19 + Delivery ($0 with Prime/ $39) @ Romoss Amazon AU


Amazing prices. Be quick before they're gone.
Lightning deal, stacks with the 20% off code, thanks to Clear.

Other variants available:

Taken from a previous deal,

The Sense 8+ and LT20PS+ have multiple fast charging technologies including 18W USB-PD via USB-C, Quick Charge 3.0 via the blue USB port and 5V/2.1A via the white USB port. For recharging it has USB-PD via USB-C, QC 3.0 via Micro USB and and 5V/2.1A via Lightning. Other fast charging technologies supported include Huawei FCP, Samsung AFC (Samsung S9/10 might be compatible), QC2.0, MTK PE and Apple 2.4A.

The OM10 is a standard charging power bank with Micro USB, Type-C and Lightning input and dual USB output.

Sense 8+ and OM10 both support pass-through charging with a display that can show battery percentage, charging voltage (V), charging current (A) and fast charge mode with a press of the power button.

Edit: Deal is 100% claimed, join the waitlist.

Related Stores

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closed Comments

  • I…. Don't….. Need….. Another….. P….ower….. Bank……

  • Is this much bigger than the 20,000?

  • Can it charge laptop too?

  • +5 votes

    Just wow.

    Another 2.6KWh (24x30AH) for my off grid system for only $681, plus about $10 in wire from hobbyking and half a day splitting the cases and wiring them in. These prices are incredible and coming down so fast.

    • wrong thread?

      • +1 vote

        No, why would it be? These batteries are the lowest (edit: lipo) $/KWh I've ever seen.

        • Interesting take but curious to hear more about how one can save energy /money with this concept

          • +13 votes

            @adrianhughes1998: From a few months ago I bought (too many) 20AH ROMOSS packs and expanded my diesel genset supplemented off grid system.


            Tesla PowerWall 2: 14kwh, $10,000

            Romoss 20,000mah PowerBricksCableTiedToAWallSomewhere: 190 needed, 14kwh, $4560

            This bargain has dropped the price to match a Tesla Powerwall 2 capacity to only needing 123 battery packs. At the current price, you can get the batteries (only, no control circuits, wiring, mounting or cool/heating) for $3,500

            A real bargain for DIY off-grid people.

            • @bm: well done this is intense. i know hardly anything about this off-grid stuff, but i'm guessing that you can save tonnes of money on electricity bills by not being needed to connect to said company's electrical grid

              • +8 votes

                @adrianhughes1998: Electricity is still much cheaper than going off grid if you only count the KWh rate.

                My area has nearly tripled the daily supply charge in the last 10 years. I'm on the garbage feed in tariff of 12c/KWh so I try burn as up much energy my solar generates before exporting it.

                I store as much energy in the morning, while running a heat-pump hot water heater, fridge, freezer and climate control hot/cold water storage heat pumps before exporting excess solar.

                I went from exporting a peak of 26-27kwh a day to only 10-15kwh a day and importing down from 5-6kwh a day down to 1-3kwh a day. This will drop as I increase my battery storage. I just bought the 1.6kw diesel genset so I'm experimenting with waste heat capture (for water heating) and trying to learn how to calculate whether starting and running the genset will be more cost effective than discharging the lipo batteries further which contributes to reduced lifecycles.

                • @bm: There was some Australian guy that made some software that feeds back into the grid during periods of peak pricing but I can't remember his name or the software/battery system. It seems like a great efficiency boost for small systems.

                • @bm: Thanks for this hopefully ends up well and cheaper for you consistently

            • @bm: They don't supply enough juice for most devices though?

    • Can you buy 24? I can only add qty 1

      • I didn't try, the missus will kill me if I did before Christmas.

        I tried and you're right, I can't find how to add more than 1. There goes everything I said :(

    • What is the 30AH voltage though? It's usually in 5V (USB) for these instead of 12V, so to get to KWH this is going to be 30x5 = 150Wh rather than the Power Wall rating which is in 12V.

      So you really need to divide the 30AH by 2.4 to equal 12V AH, giving you 67 batteries (rather than 24) required to get to 10KWh.

      I'm not sure why batteries are rated in AH rather than WH it's too confusing.

    • u got a forum on this? photos etc? super interested!

  • Awesome post..
    Grabbed another one to add to the stable lol

  • Thanks OP, I didn't even need it. But what the heck

  • Thanks OP. Grabbed one of the 10,000 ones. Bargain indeed!

  • Thanks Op… got one lt20ps+ need the quick charging one :)

  • How does the 10000mah one compare to the xiaomi 10000mah 2s?

    • I was wondering the same but for $13 I just bought it. At 10000mah you're really only charging your phone once or twice on the fly so it's really much of a muchness.

    • Xiaomi 2s outputs at 18W (12V, 1.5A/9V, 2.0A).

      Romoss inputs/outputs at 5V/2.1A (equates to ~10W max). So can't use fast charge with iPhone 8 or later using USB-C lightning cable.

      • if you know Chinese you can search on “ZHI HU”. If not, I just find the recalled news in 5/11: recall the OM10 (10000 with circular display) manufactured in 1/6/2018 to 20/6/2018 and 15/4/2019 to 17/4/2019 total count: 3792. Reason: potential spontaneous combustion risk

    • +4 votes

      Let me respond here.

      I pulled apart 24 of the 20,000mah packs to throw away the electronics and use the batteries and supplement my grid tied, but about to go off-grid system. They're charged nearly daily to no more than 4.03v/cell and discharged to no less than 3.65v/cell.

      None have caught fire yet. They've been in use for 2 months and I reckon I work them harder than most people would.

      100% charging and 0% discharging is what destroys lithium batteries. Keep them between 25-75% and they'll last metaphorically forever.

      • how do you avoid something being charged to 100%??

        • +1 vote

          100% for most lipos is 4.20v but many phones use lihv (lithium hi-voltage) and go to 4.35 or 4.40v or even higher. The higher the voltage, the faster the battery will wear out and fail but since most people replace their phones every year, manufacturers don't care.

          There are a few apps designed to make your battery last 2-5 years longer than designed for like ACC or Battery Charge Controller, however they both need root.

          Battery University did a great article on lithium battery life. Charge and discharge it 40% instead of 100% and you'll get 2.5x more full cycle equivalent life, cycle it less and it will last even longer. https://batteryuniversity.com/learn/article/how_to_prolong_l...

          • @bm: So does the ceiling and ground levels of the charge and discharge matter or just the range example 0% to 100% is bad but 60% to 90% is good but 40% to 70% is better.

            Like does it matter at what voltage you bring it up to or drop it down.

            What is the absolute optimum charge and discharge range % and volt wise and % variance or gap.. example 20% (40% to 60% right in the middle).

      • Thanks bm, had no idea about this, always charge mine to 100% and thought that discharging them all the way was better than just midrange charging.. whoops

  • Thanks OP, grabbed the 30,000 model.

  • +2 votes

    I don't need it but I bought it.

  • Thanks OP. ordered ROMOSS LT20PS+ 20000mAh Power Bank

  • At 89% claimed, 30000mAh Showing up as $38.39 for me not $28.39 as in post subject line.

  • Does anyone know if 30,000 can be taken on Cary on Baggage domestic and international? Thank you

    • Most airlines stipulate 100 Wh is the max but I've never seen any that actually check.

    • As mentioned here, as long as you get permission from your airline then you should be fine.

      • Exactly right. Between 100-160Wh (which I'm fairly certain this battery is, although I can't find it specified anywhere) requires operator (airline) approval to carry, prior to travel. Obviously must be carry-on and not checked luggage. I had my carry-on battery checked for Wh rating on its cover when I was transiting through Guangzhou China last year so it is enforced in some places.

    • Bangkok would ban this. I saw that they limit upto 28000 mAH from memory on power banks.

    • 26400 is a common limit, i wouldn't take the gamble :\

      i've seen some people check but not understand what they were checking (MEL)
      i've heard of some airports not allowing you to carry anything which doesn't have the values clearly labelled (eg faded or scratched off)
      i had my checkin luggage pulled out in front of ~300 people at the gate at NRT along with 8 other people while the security guys opened our suitcases and found tiny powerbanks that we'd accidentally checked in (my mate had one in his toiletry bag which was in my suitcase)

      airlines are legitimately concerned about power banks catching fire on planes! :P

    • Yes, check with your airline before traveling. Last week I flew Bangkok-Guangzhou-Melbourne and forgot about some GoPro and Canon LP-E6N batteries I'd left in my checked luggage. My bag arrived with the lock cut off and $300 worth of batteries removed.
      Airlines are taking batteries and powerbanks seriously.

  • Nuts 2nd one bought within the day.

  • I don't have prime but didn't have to pay shipping for some reason

  • Tempting but don't really need it.

  • I wouldn't mind a power bank for times when the power goes out and I might have forgotten to charge my phone. Do these last if you have them stored away after charged? Are these some of the best prices?

    • +1 vote

      For $30, if you keep it fully charged and in the fridge, it'll only lose 10% of it's capacity per year. Pull it out of the fridge once every few months and top it up.

      Don't keep it in your car or in the sun unless you want to replace it in 6 months.

      • Nice thanks

      • Don't freak out about keeping it in car. I live in warm part of AU and have had power banks and battery packs in car

        ( glove box and/or under seat ) and keeps charge for many months without any issues. Battery life is most likely

        reduced by 10-20 % but if used and charged correctly otherwise, could last 3-4 years instead of 3 1/2-5 years,….

        and there when I need it when going out with car.

      • Can batteries lose all of its capacity in say like 10-20 years or is there a hard limit or stop where they just stop losing capacity and stay at that limit forever?

  • The 20,000 MAH is showing at $29.59 for me.. I applied the code as well. am I doing anything wrong?

  • Do you guys know if any of these will fast charge my samsung s8 and which is the maximum i can take on most airlines?

  • Finished

  • What's the difference between the SW20PS+ and LT20PS+? I want to know which one is better in charging a Switch.

  • 30000 is gone ? 100 % claimed ??

  • Is Romoss good?

    • I still use both Romoss PB's I purchased in 2014. Are they good? Well, 5 years and still going strong.
      Among the others I've used in the last few years, the Romoss PB's are the only that have stuck around.

    • I rate them. It's the best value for a powerbank that lets you charge it using lightning, usb c or microusb.

  • Purchased this one back in Sep, it's sturdy and good to have when you're out of the house for a few days or travelling.
    Just bought another one, cheap az nutz

  • Seem to all be sold out

  • @clear …. any chance you bring back this deal please :)

    • +4 votes

      The prices weren't supposed to be this low. Amazon decided to put them on the Lightning Deal earlier than expected so everyone here has managed to score a once off good deal.

      • I unfortunately missed out on both the 20 and 30000mAh bargains ( got the 10000mAh as gift for Apple user ) and thought that these prices were much lower than the regular AU deals even for a flash Amazon sale, most likely at cost or below price.

  • May be a dumb question, but is this appropriate for charging a nintendo switch? Cheers

    • In description: "3 USB outputs enable to charge a mobile phone, a tablet or a Nintendo Switch simultaneously at maximum speed up to 3 amps."

      I don't see why not

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