Charging my Iphone 6s with a cable has become a real headache for me, where the cables keep getting "broken" and not charging
Is there an alternative way to charge in a cable-free way?
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The technology you may looking for is 'QI wireless charging'.
There are covers like LingsFire® 2 in 1 Qi Wireless Cover (German link) using that technology and there are other approaches like LEAPCOVER Universal-QI Wireless Receiver Patch (German link as well) where you can actually fit it into your iPhone.
I found a link for you addressing that: www.forbes.com/sites/ewanspence/2014/12/11/qi-wireless-charger-iphone-6/#2d1685987fb2
You may also do a Google search with the keywords 'qi' and 'iphone'.