Unfortunately, this deal has expired 21 July 2023.
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Posted 12 July 2023
Charmast 100W PD Power Bank 20000mAh £38.47 with voucher - Sold by Chen Ying Ke Ji / Fulfilled By Amazon
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iwantsomecheapstuff
Joined in 2017
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About this deal
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Seems like a good deal for a 100W battery bank
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Select the coupon on the product page to get this price
Details
Help & Information
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Select the coupon on the product page to get this price
Details
- 100W Huge Charging Power - 100W PD output means it can charge your MacBook Pro perfectly, just as good as the original charger. Provides enough power to charge laptops like MacBook/MacBook Pro/MacBook Air, also perfect for some PD phones like iPhones.
- 2 Hours Fully Recharged by 45W USB C Power Delivery Input - It supports mighty 45W PD input, to get a full recharge in just 2 hours by 45W PD 3.0 power adapter, 18W USB C PD/QC 3.0 power adapters in just 6 hours, standard 5V-2A power adapter in 11 hours.
- 20W PD & QC 3.0 Quick Charge - All outports support fast charging for various mobile devices, and charging speed is 4 times faster than the other traditional battery bank. You can also charge 3 devices at the same time with their different outputs( total 100W).
- Massive 20000mAh Capacity - 20000mAh high capacity portable charger can charge iPhone 11 Pro Max almost 4 times, Samsung S10 4 times etc. Adopt high-density lithium polymer battery cell(tesla power pack), ensuring a more stable, faster and powerful charging speed.
- Low Current Charging & Compatibility - Advanced Low-Current Charging Feature, especially perfect for low current(below 60mA) wireless bluetooth earphones. Highly compatible with the majority of Type-C NoteBook, MacBook, iPhone and Nintendo Switch.
Help & Information
More details at Community Updates
Edited by a community support team member, 13 July 2023
30 Comments
sorted byUsing my laptop and also using it to charge a power station I got ~95w out of it. Tested with a USB power meter as well as the PowerStation readout. My laptop wants 100w lets you know if it can't get it and it was quite happy with the powerbank.
I did a quick discharge test and it pulled 70% of the rated size, which is about what you would expect. It worked out at 14000mAh for 3.7v. In Wh it pulled 52Wh which is 70% of the rated 74Wh
Of course there are people writing reviews that are just cut and pasted from the description, I find it disheartening because it takes a lot of my time reviewing something. It says a lot about Amazon that they allow this.
I also have to be very careful what I write otherwise my review gets rejected.
Power bank Test Database (powerbank20.com) (edited)
I just checked and I already have a Charmast 65w PD power bank that I have had for three months so far and that has been great. I have used it to charge phone and stuff including my laptop on the go. (edited)
I have that same power bank as they are discussing and just did a quick test running my laptop and using a USB C power meter that tracks voltage, wats, mah etc.. (easy to get these off amazon), though this is not an ideal way to do it as it is not a constant load.
I concluded that the power bank is within the expected capacity range, and did not find anything concerning.
My results were, at ~ 20v I got over 3600mah, which at 3.7v becomes over 19000mwh, over 80% of the stated 23800mah. I have seen the conversion rates for this power bank is > 70% in other's tests so it seems fair.
[update] a 2nd test was not as good as that came out at ~17000mwh but that's still 70% (edited)