Charmast 20000mAh Power Bank 100W PD $54.92 Delivered @ Charmast AU via Amazon

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jerdp on 01/01/2024 - 11:09 amazon.com.au (478 clicks)

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Tick the 35% off coupon to bring up the final price of $54.92.

Amazon description:

About this item
✨【Massive 23800mAh Capacity】Compact 23800mAh Power Bank can charges an iPhone 12 Pro max almost 3.5 times,iPhone 12 Pro 4 times, iPhone 12 4.3 times etc.
✨【100W PD Power Fast Charing】The Battery Pack with 100W PD output that can charge most laptops like MacBook/MacBook Pro/MacBook Air, and perfect for some PD phones like iPhones.
✨【18W PD & QC 3.0 Quick Charge】All outports(2 USB C & 1 USB A )support 18W Power Delivery fast charging for devices. You can also charge 3 devices at the same time with there different outputs( total 65W).
✨【45W USB C Power Delivery Input】External Battery Packs supports mighty 45W PD input, to get a full recharge in just 2 hours by 45W PD 3.0 power adapter(Not included), 18W USB C PD/QC 3.0 power adapters in just 6 hours, standard 5V-2A power adapter in just 11 hours.
✨【Low Current Charging & Certified Safe】Advanced Low-Current Charging Feature, especially perfect for low current(below 60mA) wireless bluetooth earphones. Built-in safeguards protect your devices against excessive current, overheating, and overcharging.Can be used on Plane.

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• 

  beastontheroad on 01/01/2024 - 11:29

  Massive 23800mAh Capacity in the description, 20000mAh in title

  • 

    jerdp on 01/01/2024 - 11:36

    +3

    Sorry i just copied it straight off the amazon description.

    • 

      beastontheroad on 01/01/2024 - 11:59

      +2

      All good. Their mistake.

• 

  pax on 01/01/2024 - 11:32

  Can anyone comment on the quality of this brand? I've not heard of them before.

  • 

    bond008 on 01/01/2024 - 11:49

    +1

    found some comments here https://www.reddit.com/r/UsbCHardware/comments/x6fonz/though…

  • 

    beastontheroad on 01/01/2024 - 12:00

    One of the reviews said it doesn’t last long on 100w charging mode due to heat

    • 

      jerdp on 01/01/2024 - 12:06

      Definitely recommend reading more detailed reviews and doing a bit more research… I shared here foremost cos of the coupon remaining active after the deal got activated sometime last night in my watchlist. In case there are those already familiar with the brand and had prior good experience who sees value in the added coupon discount.

• 

  exile on 01/01/2024 - 12:24

  +3

  I have the older 65W model and would not recommend this brand at all. That Reddit post is spot on. The capacity is only about 60-70% as advertised. super plasticky as well.

  Had it for 12 months and used it about 20 cycles. During my last full recharge it went from 100% to 0% when I plugged in my device. Now I can only hear a coil whine when I try charging it again, but too afraid of trying to charge it up again as I suspect the electronics has been fried somewhere in the unit and don't want to overcharge it and cause a fire or something.

  • 

    beastontheroad on 01/01/2024 - 14:07

    Buy lots them since they are so great

• 

  SmoothCactus on 01/01/2024 - 13:08

  +19

  I ran a short battery of tests for this, I didn't do a comprehensive test as this fits into a very specific price range that comes with a lot of sacrifices.

  It's important to know all batteries are consumables, even rechargeable ones. Of the two types that are commonly used, flat lipo packs in battery banks tend to perform the worst, and by a significant order of magnitude.

  Of roughly 200 lipo banks I've tested, 80% of them deteriorate in the capacity they can hold unreasonably quickly, I'm talking within months, often before warranty expires otherwise on average nearly 95% of my units have significant degradation that would render it useless to carry by moderate use after 18 months.

  This degradation is sped up by drawing higher power, which this states to do up to 100w.

  So more about this unit specifically..
  - It doesn't do 100w with my unit sustained. It fluctuates heavily once there's some heat and it has no way of managing that other than to throttle down the output lower and lower. This is very common in poor quality lipo cells because the ones in particular weren't designed for high current draws and unfortunately this occurs so invisibly without the user realizing unless they carry around testers.

  • The capacity is always a lie in cheaper banks under $100. Most cases this is because the cells are realabelled and rebadged in China during a refurbishment process where they're then sold on to bank manufacturers who then have used cells either knowingly or unknowingly. Either way most lipo banks I've tested have a capacity where you can remove 10-30% off the advertised rating (excluding conversion efficiency). My unit was sitting at 15580mAh including efficiency.

  Once those cells degrade, the total charge it can hold will only fall, until a 100% charged bank will give your phone 2% and then shit the bed.

  So who is this for?

  • If you're mainly charging low power devices
  • If you need something RIGHT now and quickly
  • You're limited in budget right now but maybe you can afford to spend the extra later on.
  • You have no concerns about it becoming ewaste within 12-18 months

  2/5 cacti

  • 

    Prong on 01/01/2024 - 15:53

    +1

    I am in no way defending this power bank, as I don't have one.

    But I had some questions about your testing.

    1) Do the lithium polymer cells have any identification code on them? What configuration are they in?

    2) When it throttles the output, does it renegotiate to supply a lower amperage, or just fail to provide the negotiated amperage? Or some other behaviour? Can you share the logs of this, as it is interesting behaviour I have not seen from a power bank before.

    3) What voltage and amperage were you testing at when you recorded 15,580 mAh capacity?

    4) What are the recent models of power bank have you tested that don't meet the advertised rating, excluding conversion efficiency losses? What method do you use to determine what is capacity loss, versus efficiency loss?

    5) What are the recent models of power bank you have tested that degrade significantly within 18 months?

    • 

      SmoothCactus on 01/01/2024 - 19:26

      +1

      Hiya

      Its good to post the deal either way, since regardless of all this theres use cases and some are more suited towards the lower end banks especially if all youre doing is charging a phone.

      For starters its worth noting, these are rebadged chinese banks that come from a few manufacturers that do things differently. I have seen variations inside of what is the exact same shell in a lot of models. So while im fairly sure the unit im speaking of is the same (exact same outer shell) there's always chances things are slightly different batch to batch.

      1) Usually they do yes - the problem is there arent universal standards that require manufacturers to label, it's even more problematic in China where the structure of the market LITERALLY makes it more problematic. Usually what you will see is the manufacturer name or abbreviation, the voltage, the mAh rating as well as a number that denotes the dimensions of it. For example, when you hear 18650, thats 18mm diameter and 650mm tall, the same system exists for lipo cells. Its important to know this is NOT the model number, merely the dimensions.

      2) I dont have logs for this, but its behavior you can see in many testing channels, allthingsoneplace and chargerlab do very well to produce graphs and logs that depict this. Initially whats negotiated is the voltage with PD, and so usually the voltage doesnt drop but the amperage does, if you have a device that can provide charging notifications, youll see it come up as slow charging in that case. In some cases it can fall so far that it just renegotiates entirely to a lower voltage state if supported, however not all devices are able to do so and those that do usually revert to a slow charge of 5v for safety. This again also depends on the PD controller as many are programmed differently, some will cut off their supply and force renegotiation, some will try to manage it while thermal throttling mechanisms kick in play.

      3) Thats a good question, especially because efficiency is different at different voltages and amperages, and with the cut off/instability, testing the same duration was tricky. I test at the highest power level possible usually, in this case 20v5a then 20v3.25a, however because of the throttling issues, I ran an average of 20v and 15v as I figured 45w,65w and 100w were the most likely to be used.

      4) I would have to get back to you, a lot of my testing is all over the place and I didnt do a good job writing and recording data when I started. I hope to dump a huge log of my findings after collating it sometime this year if health permits.

      5) Similar to the last answer, however nearly all of them were lipo cells except 1 or 2 which had other faults. I would need to get back with models as not all banks are bad within a specific brand, and no brand universally makes bad products (except heymix). Some notorious ones that are underrepoted for their failure are the Baseus Slim one, Cygnett make a very thin and slim one, Belkin used to be similar with 2 particular models,

      Basically brands are not an indicator of quality anymore, Id even go so far as to say if you go on aliexpress and search up 21700 banks, most of them would outlast or outperform (in some areas) the slimmer banks using lipo.

      • 

        Prong on 02/01/2024 - 11:13

        Please don't post test results when you have not actually tested the specific power bank in question.

        For example, this particular "outer shell" is one sold under multiple brands in various configurations, and is sized to be equipped with cylindrical cells, or pouch cells. If you read the links given earlier in this thread, they point to evidence the 65W Charmast version of this power bank has (problematically labelled) 21700 cells.

        At the very least, make it clear you are speaking about a model you are "fairly sure" is the same based on the outer shell, and that your results may not actually apply.

        If you have data logged from a known accurate tester (or other source with verifiable accuracy), then by all means post it about the specific power bank it is from. But poorly recorded data with no posted testing methodology will just add confusion. Also, please don't add speculation on aspects such as capacity if you have not tested it separately to efficiency losses.

        The same goes for other claims, such as use of refurbished cells or major capacity loss in a short time. If you have actual evidence and accurate or verifiably data, then by all means post it, as such information would be very useful. Otherwise, its problematic to speculate that hundreds of models of power bank "have significant degradation that would render it useless to carry by moderate use after 18 months", without evidence, or being able to provide any model names in question.

      • 

        Prong on 18/01/2024 - 14:48

        I have some post Christmas Amazon returns to lodge anyway, so figured I'd grab one of these and see how it performed.

        As expected, it’s terrible, and not worth even the 2/5 rating you give.

        But it certainly confirms the importance of testing specific models in cases like this, because it's quite different to what you experienced with that model with the same outer shell. Different cells, and a different control circuit, as it does not do any of the output fluctuations you found.

        I am not doing a teardown, since I will just return it, but based on the size, structural flex, weight distribution, thermal characteristics and comparison to the 65W model, this also uses 21700 cells.

        I ran a few comparisons with an FNB58 and a DL24 load tester, and I suspect it's probably using cells that meet the rated capacity - just at a very unsuitable C rating - especially considering the 100W output.

        As expected at this price point, it can't sustain 100W for very long. The cut off point is fairly consistent, but does not seem overly responsive to thermal influences, so if I was doing a teardown, I'd be interested to see if it's cutting out due to voltage sag. Up until the point of cut out, it has no issue accurately regulating the voltage and current.

        The Wh I get out is quite variable, and beyond what I would expect from efficiency variations at different loads. I suspect the cells are just terrible quality and the rated capacity at any more than minimal draw is extremely low.

  • 

    sapped on 01/01/2024 - 16:28

    +1

    Hey there Cactus, thank you so much for all your detailed reviews and sharing your knowledge about powerbanks. These are important info which most review videos won’t cover, and I’ve really learnt a lot the past few days reading your past posts!

    I’m currently hoping to purchase a power bank for my Steam Deck, and wondering which is the better choice and can last the longest?

    Option 1 is ZMI No.10 65W, using Samsung 18650 batteries
    Option 2 is CukTech No.15 120W, using Yiwei 21700 cells

    They’re both similar price currently so longevity is the main thing I’m looking at, which one would you say can last me the longest?

    Also will any of these options have issue charging the steam deck while playing? Like battery degradations for the deck or power banks for example?

    Thank you so much again for everything and really appreciate your reply!

    • 

      SmoothCactus on 01/01/2024 - 19:05

      Heyo

      Both options are actually a lot more similar than you may think. ZMI was a subsidiary of Xiaomi originally, they had such disruptive performance in the space and ended up forming their own company… called CukTeck.

      Much of the initial design philosophy, standards, quality control and what you should expect are in both, of the 2 cuktek products I used I was happy with both and were one of the few banks I couldnt bring myself to tear down without spare units.

      HOWEVER - ZMI is tested through time. Ive mentioned this before but the cells inside them are literally some of the best money can buy, and they arent used or refurb, theyve always been within +-2% of rating excluding conversion efficiency. I have several of the zmi, and I know more than dozen amongst colleagues and friends whos ive tested and perform similar to mine, thats to say even after 2-3 years of battering the thing down, its level of degradation is minimal and predictable per what the manufacturer rates it for.

      You cannot ultimately go wrong with either, but if longevity is your concern I would advise the ZMI when its on sale, or on aliexpress. I use it for the steam deck and a laptop and it is a great option.

      I hope this helps

      • 

        sapped on 02/01/2024 - 18:14

        Hey there Cactus, thank you SOOOO much for your detailed reply, it's exactly what I'm looking for and truly appreciate this!

        In that case I'll be leaning more towards the ZMI, although a main question I have is the technical aspect regarding 18650 and 21700 cells. From most information I've gathered while googling, it seems 21700 is generally a large improvement over 18650 cells, with better charging potential and longevity.

        Would this also hold true for fast-charge power banks? Where I can get some additional months out of CukTech 15 over ZMI 10 since the former is using the newer battery type?

        Also is Yiwei a reputable brand for battery cells? The company seems to be pretty new and mainly focused on cars, so I'm curious how will Yiwei's newer 21700 compare to Samsung's older 18650. Especially when Samsung's batteries are the most well regarded from many of your previous posts.

• 

  nuttapillar on 01/01/2024 - 13:18

  So none of the ports are actually 100w? I wish the number in the title would represent the fastest single port, not the total…

• 

  nuttapillar on 01/01/2024 - 13:19

  If they're lying about the capacity, can't we just test it, prove it to them, and then get a refund? Free power bank, and serves them right for false advertising?

• 

  Devaust on 01/01/2024 - 15:08

  I stick to UGREEN 145W Power Bank 25,000mAh 3-Port Portable Charger 140W Output PD 3.1 Laptop Powerbank Battery Pack Digital Display. Purchased for ~ $135AUD.

  The Ugreen & Xiaomi models are generally of higher quality assurance. I use mine to charge Steam Decks & Asus Rog Ally.

  Also I would recommend VEEKTOMX 100W Laptop Power Bank, 20000mAh Fast Charging MacBook Portable Charger Extra 100W (5ft) USB C to C Charging Cable with PD 3.0 & QC 3.0 over this.

• 

  dfg555 on 01/01/2024 - 15:25

  One day SUPER VOOC/Similar Alternative Power Banks will be prevalent in the market………. Extremely limited options for now.

  • 

    sureyoucan on 01/01/2024 - 18:22

    +1

    Yes… One day.. that's what I thought 3 years ago.