What is SpaceFN and why you should give it a try
The SpaceFN concept - setting up your space key as a layer switch when held - is probably one of the most useful tweaks in the keyboard hobby. Let me explain how it works. My SpaceFN article on kbd.news made some rounds recently - quite surprisingly given the age of this concept. This piece you're reading is a condensed version of the full post. If you're left with unanswered questions, you'll most likely find the info you're looking for in the original write-up. On my imaginary top list of the most useful keyboard features, tweaks and hacks, SpaceFN would deserve a podium finish for sure. But what makes it so special? In short: SpaceFN is easy to implement, easy to learn, costs nothing, can be used with any keyboard, and can improve your productivity instantly. I will list its benefits below, but can state right at this point that the SpaceFN concept, setting up your space key as a layer switch when held, is clearly one of the most useful tweaks in the keyboard hobby....
Apr 30, 2024
Phones/tablets and their chargers operate off-spec (on purpose), for supplying more than 500mA. They do it for offering you shorter charging times. This is why your phone charges slower if you charge it from a PC, and this is why some PCs/laptops come equipped with "special" USB ports that can provide more than 500mA.
So, if you intend using this cable for charging your phone from a "plain-old" USB port on a computer (which will anyway deliver up to 500mA), you can safely order 3 ft long version (on 6ft, it's 4.6V already on a 500mA load). Longer ones will still work at the expense of increased charging time.
However, if you intend charging your phone via a source capable of 1000mA or more, be it a charger or a special USB port on a PC, you should choose 1ft option. Longer ones will still work at the expense of increased charging time (an example here: http://forum.xda-developers.com/showthread.php?t=2545497)
To answer your question; as a _backup_ cable, yes, it will work. Better keep it short though. You need to go for "USB A to USB micro".