| Electronics > Projects, Designs, and Technical Stuff |
| Wireless power bank 10,000mAh+ >10W, Qi? Kit or commercial off the shelf (COTS)? |
| (1/1) |
| 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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