Electronics > Projects, Designs, and Technical Stuff
Wireless power bank 10,000mAh+ >10W, Qi? Kit or commercial off the shelf (COTS)?
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FrankE:

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).
twospoons:
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.
Kasper:
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.
Rerouter:
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,
FrankE:

--- Quote from: Kasper on February 19, 2020, 05:35:53 am ---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.

--- End quote ---
That was my reasoning for thinking of getting one.


--- Quote from: Rerouter on February 19, 2020, 11:57:28 am ---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,

--- End quote ---
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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