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wireless charging with ottobox on

The Otterbox is probably too thick for the wireless charging to work. I'll assume you're using an aftermarket coil with the stock S5 back since I know the Samsung wireless back won't fit inside an Otter or most other cases.
Most Qi setups have a stated range of up to 5mm, so if the phone back + case is thicker than that it probably won't work. There are some that claim 8mm, you might try one of those.
I have my S5 in a fairly beefy case although it's not quite as heavy as an Otter, with an Ebay-sourced coil and pad it charges fine. The placement is critical though, since the coil is offset from center inside the back the phone has to be placed slightly off-center on the pad or it won't charge.
 
I have two S5s with the Speck CandyShell Military grip case, and they are thick.

I had to buy several Qi receiver coils before I found some that actually do charge at 8 mm of spacing.

I also have found, that the Qi chargers are very sensitive that the center of the wireless charging coil is over the Hotspot on the Qi pad.

not the center of the phone... On the S5, the battery is to the Right side of the case viewed from the back.
Think "left side of the case" when viewed from the front.

I have to offset the two S5s and my Note 4 on the Qi pads forwards and to the right just a tad.... you have to experiment to find the best position to make it charge reliably every time.

I now know how to position all of my phones, and they all charge the first time.
and all of them have a charger that states it will work at 8 mm spacing.
 
I used an aftermarket coil with the original back and an Otterbox defender and had no issues with charging except I don't like the qi since it doesn't maintain the charging when the battery is full. This meant that the phone only had 80some % power in the morning.
 
I used an aftermarket coil with the original back and an Otterbox defender and had no issues with charging except I don't like the qi since it doesn't maintain the charging when the battery is full. This meant that the phone only had 80some % power in the morning.

Wow that's crazy that your Qi charger kills the charge after the phone reaches 100%. It's not the problem with Qi charging thou, it's more that your charger doesn't design the power management well enough. A good Qi charger will enter the trickle mode once your phone battery reaches near max capacity, where it drops it's power output to a fraction of what it was and just maintain your phone at the full charge.
 
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