[Galaxy S 4 Active General] jt3:
This information is all available elsewhere on these forums, but this seems like a good place to repeat and centralize it, so...

Once you do a wireless charging mod, your S4A may experience a couple common problems.

The first is that many daydreams use so much power that a lot of wireless chargers can't keep up, and you can actually drain your battery. Even if you do manage to eek out a positive charge, you may find that an overnight charge can't bring your battery to 100%. I used to use the "Beautiful Widgets" daydream, and found that I only got about 1% every 10 minutes or so. If you do the math, that's over 16 hours for a full charge from empty, so that could certainly be a problem.

If you want to use daydream settings, you may need to experiment to find one that minimizes battery drain. The one that seems to work best is Lucid Daydream Screensaver, mainly because it's one of the only ones (possibly THE only one) that can adjust brightness automatically based on the light sensor. Still, there were several others that worked fine, and it really depends on what you're looking for, so YMMV. Jut be wary of bright backgrounds and crazy animations.

Another common problem is that once fully charged, your phone will constantly engage and disengage the charger. You'll see a notification that the phone is fully charged, followed by the notice that you've started wireless charging, followed by a notification that the phone is fully charged, and... well... you can see where this is going. To make matters worse, every time the charger is engaged, you'll get the "charger connected" sound. The bottom line is that your phone will suddenly become very annoying, especially if it's sitting at your bedside. Samsung actually considers this a feature, so if you're looking a an official fix, you may be in for a very long wait, but fear not! There are some fixes. Unfortunately, they require root, so that's the first step.

TO GET RID OF THE NOTIFICATIONS

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You'll need to install the XPOSED mod. This mod allows a LOT of system-level changes, some of which are active by default, so please read up on this before applying. More information can be found here. Once installed, the key settings are under the "Framework" section. You'll want to select the "Hide full battery notification" and the "Hide wireless charging dialog" settings. This won't necessarily keep you in daydream mode, as the phone will still "wake up" every time it sees the charger disconnect or connect, but it does seem to help.

Unfortunately, while this also increases the time between "charger connected" sounds from a couple seconds to, well... longer, it doesn't get rid of it completely, so...

TO GET RID OF THE "CHARGER CONNECTED" SOUND

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You'll need a file manager that takes advantage of root access to mount system folders as Read/Write. My favorite is Root Explorer, but there are many. Basically, you need to browse to the \System\Media\Audio\UI folder, and delete the "Charge_Connection.ogg" file (be sure to make a backup, first!).

It's important to note that once you perform all of these steps, you've pretty much eliminated any indication (other than the small lightning bolt in the battery icon) that your phone has successfully connected to the wireless charger. If your charger has its own indicator, then this may not be an issue, but if not, it may take some getting used to.

Still, this makes your wireless-charging-enabled phone a lot less annoying at bedtime. Hopefully, this will help some people keep their sanity intact when using wireless charging at night.