I've had my Galaxy s5 since September or October of last year and now it isn't charging?

I've had my Galaxy s5 since September or October of last year and now it isn't charging?
Added (1). I went on a trip and it was fine but when I got home I went to plug it into my car charger and it wouldn't charge? I tried using a small charger and the stock charger and neither worked. So I switched my phone over to one of my older phones for about a week and out of curiosity I plugged my galaxy in and it started charging but it is painfully slow. It took an hour to go up to 15% what can I do to speed it up?It's the stock charger and it gives a notification saying it isn't the right charger?

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