LGG3 doesn't charge when screen is on in car

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Android Central Question

When I drive to/from work, I mount my phone on my dash and use Waze and Spotify at the same time. The issue is that while the screen is on, the phone won't charge, but rather, it simply discharges more slowly.

I know the LGG3 has an OLED screen and tends to run hot, so I assume the screen is hogging all the power.

This wasn't an issue when I first bought it, so I replaced the battery and it still won't charge while the screen is on.

When the screen is off it's fine, but it's not ideal when I legitimately don't know where I'm going and have to unlock the screen everytime I want to see my directions.