Can non-apple charger damage the battery?

Hi,
I see a bunch of chargers on the market. Some are from reputable sources like Belkin. All these different chargers have different specifications but say they are compatible with iPhone, etc. It almost seems like if the charger has a USB plug, then it's claimed to be compatible with iPhone, etc.
However, I read here and there that Apple has a proprietary charging mechanism, which charges differently than your regular USB plug. Is that true?
It seems weird to pay $19 for a plug (http://store.apple.com/us/product/MD810LL/A/apple-5w-usb-power-adapter) , especially when things like these are available:
http://www.amazon.com/PowerGen%C2%AE-2-4-Amp-Charger-Designed-Android/dp/B0073FC PSK
http://www.amazon.com/dp/B00KVCLDJE?psc=1
So, am I safe buying these other products and charging my iPhone 6 with those? Is there any downside of doing this? Will this ruin or lessen the life of the iPhone battery?
I also wanted to buy this for my house:
http://www.amazon.com/Belkin-SurgePlus-6-Outlet-Mount-Protector/dp/B00ATZJ606
, but again, I am not sure if just because they claim it's compatible with iPhone, it's not going to damage the battery because it may send too high of a current or something like that.
Any help and advice would be appreciated.
Thanks!
-YC.

Can you suggest any? I see a lot of cables that are certified by Apple, but I don't see any wall chargers that are certified by Apple.
The main question I have is: does the charger matter or not or is it only the cable that matters? One charger maybe better than another, but do any of them actually have the potential to lessen the life of the battery or damage it in some other way?
Thanks,
-YC.

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