Android auto {car hu) or direct from phone for better phone care?

mystvearn

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Apr 13, 2015
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My car has android auto, Bluetooth and cigarettes charging port. I recently purchased a note 9 which comes with non removable battery. Previously was on note 3 with removable battery.

Which kind of setup is more kind to my phone battery?

1. Android auto via car USB cable and display at the car head unit (resistive touch screen).

Or

2. Direct from the phone through the cigarette charger. I have a mounting mechanism for just the phone. Sound via car speaker using Bluetooth. Phone display will be used

Both will turn on gps and Bluetooth on. The only difference I see is the android auto method charges the phone slower compared to using direct cigarette connection. The android auto also turns off the phone screen..

I am planning to use waze and Google music at the same time.
 

methodman89

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Feb 5, 2018
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The USB ports in most vehicles are not primarily for charging, for that you have your 12v cigarette lighter socket. The USB will usually be used as data transfer and will provide as little as 5v at 1 amp.
 

B. Diddy

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Mar 9, 2012
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Either way should be safe for the battery.

Some general guidelines to maximize your battery's lifespan include:

1. Don't let the battery discharge too deeply on a regular basis. Make a habit of charging when it gets down to 30-40%.
2. Avoid excessive heat when charging (i.e., don't let it sit under a pillow or blanket while charging). It's not only harmful to the battery, it can also increase the risk for fire or explosion.
3. Quick charging can potentially put more stress on the battery over time. Although it's generally safe and probably won't cause a noticeable difference over the typical user's phone lifecycle (1-2 years), it could have an impact if you intend to keep the phone for a longer time (like 4-5 years).
4. Best evidence shows that charging up only to 80% on a regular basis also prolongs battery life (this is what Tesla recommends for its giant car batteries), but this can be a hassle, for two reasons. (1) You typically need a 3rd party app to limit the maximum charge, like AccuBattery, and (2) limiting yourself to battery that goes from 80% to 30-40% can be unfeasible in your day-to-day life.

Battery University is a great resource for more detailed info: https://batteryuniversity.com/
 

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