Author Topic: Wireless power bank 10,000mAh+ >10W, Qi? Kit or commercial off the shelf (COTS)?  (Read 848 times)

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Offline FrankETopic starter

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I'm getting a smartphone, my first.
I'm going to need a power bank. The telephone I'm getting accepts fast wireless charging 2.0 and Qi, so may as well get a wireless one.

Any I could take apart and replace cells, coils, ports etc would be better.
Might I be better building one myself  with  modules off ebay, a full sans-cell kit,  or just buy one. I've a stack of 18650s.
I haven't seen near-universally great reviews on any of the COTS ones, most have reviews saying the product didn't work on wireless or it failed after a couple of months (though I've no idea if they overdischarged or what).
 

Offline twospoons

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I wouldn't bother. Wireless charging is awfully inefficient (under 70%, can be as low as 50%, from memory) - you'd end up wasting a lot of your power bank capacity.
Qi may be convenient for a fixed bench charger but if you are lugging a power bank around you want to get every last Joule out and into your phone.
Use a cable.

FYI I have worked for a company designing Qi wireless chargers.
 
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Offline Kasper

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I really like the magnetic usb cables.
Keep a small magnetic plug in your phone and then the cable goes on and off easily without wearing out the jack.
 
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Offline Rerouter

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Wireless fast charging usually consumes 2A @ 5V to charge your phone at about 1.1A @ 5V, meaning about 5W is lost as heat while charging wirelessly,

There is a reason those chargers get warm / hot,

If you want every last drop of power, use a cable, pick a bank with a QC3.0 controller if fast charging is your priority,
 
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Offline FrankETopic starter

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I really like the magnetic usb cables.
Keep a small magnetic plug in your phone and then the cable goes on and off easily without wearing out the jack.
That was my reasoning for thinking of getting one.

Wireless fast charging usually consumes 2A @ 5V to charge your phone at about 1.1A @ 5V, meaning about 5W is lost as heat while charging wirelessly,

There is a reason those chargers get warm / hot,

If you want every last drop of power, use a cable, pick a bank with a QC3.0 controller if fast charging is your priority,
Thanks. Does QC3.0 work with Samsung Galaxy S? Samsung Fast Wireless Charging 2.0 @>=10W) and
Qi wireless were mentioned but both for wireless. Not sure what protocols are in use for charging.
I prefer using slower charging for Lithium (and NiMHs) to keep down heat and preserve longevity of cells, though I guess there will be times I would want to use faster charging.
 


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