Will Charging A Phone Drain A Car Battery. If the car is turned on the cell phone is receiving power from the alternator just like the rest of the car. This advice holds true for the regular chargers youd use as well as car phone chargers.
White charger with a LED light indicator. That said youll never kill a car battery by charging a single phone if you drive the car at least 15 minutes every day. But the amount of power a phone takes is much less than even the air conditioning and that is much much less that what it takes to move a 4000 lb car even a short distance.
A battery functions best when its kept between 40 and 80 percent.
The phones and the radio were a miniscule drain compared to activating all the car electronics without the generator running. The mission of the alternator is to charge the battery while the car is running. More importantly the phone was now charging in car and house and not shutting down when unplugged. There is probably plenty of application running that is quickly draining the battery before its having a chance is charging.
