How do charging keychains work?

[MrOracle]

You have to have a USB charger (the actual transformer) - those keychains are really just a short USB cable (USB A to Lightning, in the case of an iPhone cable - they also make USB A to Micro B or USB A to USB C).

Obviously, you could plug the cable into almost any USB A port and get SOME power, but a normal USB A port only gives 0.5 amps of 5V power, while a higher-end charger can provide 2.4 amps of 5V power, and for non-iPhones, can provide even more current at higher voltages, so a dedicated charger will charge the phone much faster than most random USB ports.

[Jjpayne]

I think it's just a charging cable from the look of it... I could be wrong though 🤔

[1stranger]

Lol.. One of them (small end) plug into to the phone. The other to the adapter. If I couldn't explain, look at the photo..

[menina]

Maybe you need to plug it to a transformer or a computer. I've never heard about charging keychains.

[GoodGuyBreakingBad]

Would that by chance go into the computer?

[Aiko_E_Lara]

It looks just like a really short cord that needs adapter only tied to a key chain. That's probably for charge banks in your pocket.

[Iron_Man]

I’ve never heard of that before charging a keychain

[blondfrog]

thicker ones goes into your car. Not all cars have the outlet for that.

[mrgspoter]

They call on shadows to fester into a digital presence from them places

[serious]

I don't know. No idea.

[Gwenhwyfar]

Battery power I think

[SuccessfulHornDog]

I assume that they have a battery

[lazermazer]

Blocking you. Too many invites.

[Sabretooth]

don't know.