My IPhone Charger Won't Always Work?

My phone charger won't always work all the time. I tried blowing the charger and I restarted it three times and waited like 30 minutes once. But it still won't work! Oh and when I plug it in it charges but it gains like 1% every 40 minutes! So please help and btw my charger and box thing is in perfectly fine condition. ( Hopefully)

My first thought would be that the charger is bad. If you are absolutely sure, then you may want to check the following website. Your iPhone maybe eligible for a FREE battery replacement. Here is the website to check for eligibility. You must have an iPhone 5.

https://ssl.apple.com/support/iphone5-battery/

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