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How to charge your iphone with an unofficial lightning cable 
Search for an mfi-certified cable. 
Mfi (made for idevices) cables are certified by apple to work with your ios device, even if they aren't made by apple itself. Mfi-certified cables will not cause your ios device to stop charging when you use them.
While mfi cables are cheaper than apple cables, they still aren't inexpensive. Look for the " made for " certification.