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Galaxy Charging Current Free?
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Have you checked the charging current to ensure you're getting a proper charge? My previous car charger was a Griffin Technology Powerjolt Dual Universal. I use the Android app "Galaxy Charging Current" for testing. When charging my Samsung Galaxy S4 using a generic USB cable on the Griffin charger, I got 660 mA. Using the same generic USB cable on the Arcadia Triple USB charger, I got 760 mA. When I used my official Samsung Galaxy S4 charging cable (the one that came in the original box with the phone), I got 1,200 mA. I did not test the official cable with the Griffin.
Note that the charging current did not go above 1,200 mA because that's all the Galaxy S4 is designed to accept. The Galaxy S6 that's coming next month will likely allow a higher charging rate like 2,400 mA. That's the point of the "fast charge" they advertise.
I use the 3 outlets to power:
1) My full-time use dashcam (G1W-C)
2) Charge my Galaxy S4 (soon to be S6)
3) Charge whatever phone my passengers might have
Download Galaxy Charging Current app and see the charge rate for yourself. I've seen significant differences between USB cables. I don't know what it is about the cable that's different, but here are my test results:
GS1 official cable, charging my GS4 = 760 mA
GS4 official cable, charging my GS4 = 1,200 mA
I agree, to tag onto this you should download Galaxy Charging Current Free it will show you how much juice the current plug in can pass. If you are only passing ~500mA then you are barely above how much power it is consuming thus creating a minimal gain. The maximum is 1800mA for our phones.
the 500mA chargers are mainly for Bluetooth and other low power devices.
https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free
This app checks how strong your charging is. Since you're using the S4, the optimal quality should be around 1200mAh
Some would disagree with you.
If you have a samsung phone you can load an app called Galaxy Charging Current and play with different cables and power supplies. If you have a big device (Note 1,2,3,4) you can measure up to 1.8A of REAL draw.
Also try switching out cables from the charger. Some cable just don't negotiate the highest charging rate. If you have a samsung phone use this app to see how much you are really getting from the cord. less than 800 mah is not enough to keep your phone going and charging. from a 2.1 amp charger you should get 1900 mha. https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free&hl=en
Depends on which phone you use. I think your optimal wattage is 2100 mA based on the pic, but I might be wrong. If I'm reading it correctly, you're only getting 257 mA out of the max 2100 mA. Try using a friend's charger and see how much it is charging. If it's the same then your phone is the issue, else you have to buy a new charger.
I'm using Galazy Charging Current Lite for my S3. Link
It can depend on the charger cable. Charging current varies by cable. For example I have 2 good cables that have double the current then 3 of my shit cables. If you have a galaxy phone you can use this app to test https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free&hl=en
Oops, I didn't even realize it was for Android 5.0+ only, damn. Here's an alternative app I used before this one recently came out, Galaxy Charging Current.
You can use this app to see charging current, pretty useful! Galaxy Charging Current Free
Install this to monitor your charge. https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free
If you have a Samsung smart phone, https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free is a useful app to tell you what sort of cable you're using.
https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free Updated post with link.