frontpage Posted by BeigeString3016 • Last Wednesday
Apr 23, 2025 7:55 PM
Item 1 of 1
frontpage Posted by BeigeString3016 • Last Wednesday
Apr 23, 2025 7:55 PM
Anker 20,000 mAh 3-Port 87W Power Bank w/ Built-in USB-C Cable
+ Free Shipping$45
$60
25% offNewegg
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While I like Anker products, I believe the price is quite high for the capacity of the battery. However, if you need something like this, this should be a better product than some of the other products posted here which start with B — this is more likely to be close to advertised capacity (the other will be off by a good 20%), and keeps discharge to a relatively safe, and healthy for the battery ~1C max (<=1.2C if capacity is indeed 20Ah as advertised), whereas the other product will do over 2C, even 2.5C. This is a premium price for a solid product, I wish it was 25Ah (or even the FAA carryon limit of 27Ah = 100Wh @ 3.7V), but if you need one to charge laptops and will use it a lot, I'd pay the premium for a more solid product like this.
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First, your calculation of 65% efficiency is incorrect.
Second, as you mentioned, charging at 5V yields a "capacity" of 6500mAh; however, 5V is higher than the typical receiver device battery voltage (usually around 3.7V). Therefore, the actual energy transferred to the receiver battery corresponds to a higher mAh value than 6500mAh.
Third, in your earlier comment, you cited other manufacturers like UGREEN achieving 88% efficiency. I suggest you revisit their specifications and carefully read what they state about their 5V capacity.
Finally, while I understand that not everyone has the benefit of completing a basic education, ignorance is not an excuse for confidently spreading misinformation.
FROM ANKER: