Do non-Apple chargers damage your iPhone battery?
I've heard that using non-Apple chargers (regular wall outlet charger and cable for iPhone 4S to be specific) could potentially damage your battery, and diminish its battery life. I've been told this by a friend, and I also noticed Apple mentioning something like this on their website. I just want some confirmation in case Apple's using this as bait to try sell their product over other companies' available options. Can I get some confirmation regarding this please?
Also, when using my car's cigarette lighter socket to charge my iPhone 4S (with the only official Apple product being the Apple cable, considering they don't have an official Apple lighter socket USB converter), I'd like to know which adapter would be best for an iPhone. Would using a 3rd party (non-Apple brand) USB connector, along with an 'original' Apple cable damage the battery in any way? I see that the Apple shop has some Belkin connectors. Is this the brand they commonly recommend? Are there any other recommendations?
Your help would be much appreciated.
Thank you.
[Re-Titled by Moderator]
iPhone 4S, iOS 9.3.5, null