You've not mentioned your charger details. But I've got Avantek car charger from Amazon for my Galaxy S4. It's working great and good fit for my S4. Got everything perfect as it says on it's features. No less in power.
Thank You. I just got a 2.4 amp car charger for my Samsung Galaxy s3. Is it safe for the phone and the battery? My original wall charger is 1.0 amps.