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I have a raspberry pi related car project and I'm wanting to power it off of a standard car port to microusb, this shouldn't prove to be too big of an issue. The Pi charges at 2.5A from what I understand. The chargers I see are listed are over or under this amount. Will .1A difference harm this device or make it function improperly? Will adding more accessories to the pi to power change the power draw? I've got the beginners mind here, teach me.

Current cannot harm the device. Voltage spike, overheating can. Think of ampers as sandwiches that Jack eats. On his average work day, he is hungry enough to eat 3 sandwiches. He won't eat more even if you put 20 sandwiches on his table. Though if you load him shítload of work and give only 2, he will feel malnourished. RPi usually runs fine on it's, but to run various peripherals its better to have some headroom

>>158 what's the project?

>>160 So going over will be fine?

https://www.amazon.com/gp/product/B016RVSLV0/ref=oh_aui_detailpage_o06_s02?ie=UTF8&psc=1 here is what i used to plug the SBC plus scree and then charging phones and stuff. Tip: plug the rpi through a battery pack so u dont have to wait for it to boot if you dont charge it for couple days.

>>162 Sure, that's just maximum current rating for a charger, which means it can give up to so much juice (current) at given voltage. This explanation is pretty good: >>160 As long as charger's voltage is exactly as needed and there's enough current it should be okay. Just remember that if you have peripherials working from the USB power on raspi then you may need more current. Also, pi doesn't "charge", there's no battery onboard (unless you connect one I guess) it just gets power supplied from the charger, which means that you'll lose the power when you turn off the car.

>>164 (cont.) Oh, and I forgot to say that 2,5A is already with some heavy peripherials. Raspberry Pi 3 alone shouldn't go over 1A. Maaaybe a bit over 1A at most. And by spec you can get up to 0,5A from each port, so 2,5A should be enough for raspi and 3 power hungry peripherials.

>>161 Really solid wardriving setup with everything automated based on when the car is turned on and off.

>>160 Thanks much, thats an easy way to look at it. >>163 Interesting, will look into one when my next paycheck drops.