Marketplace
30MAR2024
Hi, good morning, recommend a power bank with RoHS Certification.
It quickly charges my 13PMAX to almost 60%
Compact and portable
Australia Post Standard Parcel free delivery
ZUSLAB Mini Power Bank 5000mAh Lightning + USB-C Dual Output $18.86 Delivered @ Protec.online eBay
23
AssociatedJone @ ZUSLAB on 06/03/2024 - 10:16 ebay.com.au (460 clicks)
Last edited 06/03/2024 - 12:48 by 1 other user
Last edited 06/03/2024 - 12:48 by 1 other user
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Usefulness isn't only defined by mah. I have batteries with this form factor and find them much more useful than phone shaped ones and are the battery I grab 99% of the time if I am going out and know I might run out of battery during the day.
$/mah may be higher for these, but if I only need one charge on my phone that day (99% of the time) there is no point carrying around more.
The listings for these types of powerbanks always say they're 5000mAh, but they can't even charge a phone to full
Yes, this is normal, because of charging inefficiencies in both the power bank and the phone. Typically you would expect to lose about 30% of the rated capacity to efficiency losses, if comparing power bank capacity, and phone capacity. But often a bit more or less, depending on the specific charge profile.
In this case, 5000 mAh is is around 18Wh.
OP says it charges an iPhone 13 Pro Max to 60%. The phone battery is 16.75Wh. 60% of that is 10Wh.
From 18Wh, to 10Wh, is a 44% efficiency loss, which is from both the power bank circuitry, and the iPhone charge circuitry.
That's less efficient than I would have assumed, but that may be because of the (unknown) voltages supported. Or just not very efficient voltage conversion. Still, it's well within normal, without knowing more.
More likely than not it's just a single 18650 cell so more likely it's a 3000 mah cell
I can't speak to this specific power bank, but other similar products are large enough to fit a 21700 cells.
EG, the Anker A1653 (same form factor) is 7.7 × 3.68 ×2.5 cm. A 21700 cell is 21.7 x 7cm.
This power bank looks about the right size to fit a 21700 cell. In which case 5000mAh (18Wh) is reasonable - especially since discharge is only around 1C.
The other way to sniff test this with the given info is to compare to the 60% claim from OP.
Assuming 3000mAh (~11Wh) then we are talking a ~10% total efficiency loss, which is much better than is possible in this case.
@Prong: Was going to edit my original comment to realise that I was wrong, but was already replied to by then
That sounds fair. Even so, questionable response from who is assumably a store rep. Surely they could've just explained what you just did instead of immediately pulling down the offer.
This would contain a single 18650, no chance it is 5000mah. More like 2000 or 2500 mah.
I was thinking the same. E-waste within a few months.
Not necessarily. Small powerbanks have their uses, but it should not be falsely advertised as larger
I can't speak to this specific power bank, but other similar products are large enough to fit a 21700 cells.
EG, the Anker A1653 (same form factor) is 7.7 × 3.68 ×2.5 cm. A 21700 cell is 21.7 x 7cm.
5000mAh (18Wh) is reasonable - especially since discharge is only around 1C.
OP says an iPhone 13 Pro Max to 60%. The phone battery is 16.75Wh. 60% of that is 10Wh. That's a 44% efficiency loss, which is in both the power bank circuitry, and the iPhone charge circuitry.
That's less efficiency than I would have assumed, but that may be because of the voltages supported.
That makes sense, I did not consider the larger cells available these days. Perhaps I am wrong in which case apologies OP!
this type of device with slots for 1-4 batteries would be nice then you can just use the batteries you have sitting around as opposed to being forced to use chinesium batteries or surgery on the unit
More likely a 21700 battery that can go to 5000mah.
An 18650 battery would go up to 3600mah.
Not knowing what to reply, I canceled the discount and waited to see your professional judgment.
Comments above said no chance it's 5000mah. So you're not prepared to defend the product even though you're associated & posted the deal?
21700 aren't much bigger than an 18650 and go to 5000mah. Many people don't know their battery sizes 😜
Hence why I asked the associated member. Deal is marked as OOS but eBay says - More than 10 available.
Comes across like an admission it's not 5000mah.
@WatchNerd: It's been 2hrs & still no reply. Safe to assume this isn't 5000mah, negging to warn others.
@Clear: Happy to remove my neg if the Op can prove it's 5000mah. Also hate is a very strong word, I waited 2hrs for a response.
@WatchNerd: They shouldn't need to when someone passes off the wrong information as fact. An 18650 battery can't do 5000mah so this obviously doesn't use it. It's big enough to use a 21700 battery that does.
Fortunately that person has corrected themselves
@Clear: Well to be fair it is part of the guidelines -
It's not a bargain anyway - US$10.82 + GST, Total $11.90 (~A$18.30)
It's okay, it happens often when you don't get recognition, especially from strangers
as i said before when buying powerbank dont just look at the spec and photo, best is to check any teardown to see whats the battery inside. they can make cover shell from gold but crap cheap battery and it is still useless.
Typically, power banks have an energy conversion efficiency rate between 70% and 90%. For example, if a power bank has an advertised capacity of 10,000mAh and an energy conversion efficiency of 80%, its real capacity would be around 8,000mAh. This is because 20% of the energy is lost during the conversion process.
Compared to previous INIU deals, i don't think this is a deal. 10k mah https://www.ozbargain.com.au/node/825191