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Sounds like a bad battery to me. You can get a new battery and everything you need to change it at a website called iFixit for like $30 shipped, (don't worry, for a 4S, a battery replacement is super easy, it's just 4 screws and pulling the battery connector off of the logic board).


NEVER trust a third party charger and buy the apple one it's worth it


Not only will it not damage your phone but can potentially charge it faster if you own certain iPhones. http://lifehacker.com/use-an-ipad-power-adapter-to-charge-your-iphone-6-faste-1637676153


It will not immediately damage your phone, but may decrease long term battery life. It will not decrease long term battery life. It may charge a bit faster, which is good for actual generation Li-ion batteries. What is bad for batteries is letting them discharge completely without charging. LexS


The short answer is that any USB charger is safe with any USB device; a smaller (iPhone) charger may not charge a bigger (iPad) device. You can also connect your device via a USB extension cable. The longer version is that Apple's USB chargers (whether sold with the iPhone, iPod Touch, iPad, Apple Watch, or new MacBook) are all essentially the same, the ...


The short answer is: It's debatable. It will not immediately damage your phone, but may decrease long term battery life. Apple has not officially commented on this, (to my knowledge) however it is commonly accepted that routinely charging a battery with higher amperage than it's designed to take will degrade performance over time. Yet, even that is debated. ...


No, its not going to damage anything - the iPad and iPhone have the same value of charging. You can use your iPad adapter cube and an USB cable with your iPhone. It will charge your phone the same way your iPhone charger does.

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