frontpage Posted by BeigeString3016 • 3d ago
Apr 23, 2025 7:55 PM
Item 1 of 1
frontpage Posted by BeigeString3016 • 3d ago
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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But at least Anker are honest about the mediocre 65% efficiency but this performance is junk. It means that you are carrying more weight and volume but you'll never ever be able to use it.
Veektomx is 88% $23
Ugreen 100w is 82% $55
These to name a few and there are many out there that are far better than 65%. Maybe do a bit of research. 65% is far unacceptable unless it's wireless charging.
Anker professional products tout an up to 18% loss.
I think UGreen and Veek are using laptop cooling pads when quoting those numbers. If you use Ankers in similar conditions, I suspect it'll be closer.
Anker probably has high number of returns and is safeguarding with the 65% number. Likely assuming worst operating conditions.
It's not that much, you can pop it open to see why. The two smallest are the Baseus Picogo and INIU units. It isn't much because all they do is solder the cable and then secure it with gobs of glue.
(And before anyone says there is an INIU unit that is way smaller, the keychain one that truly is, uses a pouch cell - not the 18650's these use).
Anker Zolo is larger because Anker is really cautious about fire hazard. Not the cable itself.
(And before anyone says there is an INIU unit that is way smaller, the keychain one that truly is, uses a pouch cell - not the 18650's these use).
Anker Zolo is larger because Anker is really cautious about fire hazard. Not the cable itself.
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Some manufacturers will list the effective capacity (nameplate capacity) of the power bank, when and where is required by law. Many won't tell you about it, if no law is required (like in the U.S. market).
6,500mAh = 65% of 10,000mAh claimed capacity.
6500mAh is 65% of 10,000mAh. In real world you get even less than 65%. I think you know already.
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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.
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.
6,500mAh is 65% of 10,000mAh no matter how you look at it. I go with this number. It is listed there for a reason, and is required by laws of some countries.