Do Car Chargers Drain Battery

What to do with a battery that keeps dying.

Do car chargers drain battery.

That s because car batteries suffer from the same discharge problems that smartphone batteries do just on a. Take the positive battery cable off your battery and using a good working 12v test light like this one attach one end of the test light to the battery and the other end to the positive battery cable. Depending on the circumstances that could be enough to drain your car battery dead. Leaving the charger plugged in when not charging a cell phone may also drain the battery s power but this will be a slower drain on the battery than if charging a phone.

A car battery holds around 800 watt hours of power. A typical car battery will drain in 2 3 weeks and be unable to start your car due to the parasitic draw from the car s electronics. With the negative terminal disconnected a healthy car battery will self discharge at 5 per month. The nature of charging your phone in your car poses a risk to your phone.

Do car batteries lose charge when not connected. To prevent your car phone charger from draining your car battery you should unplug your charger from the power source when it is not in use. If old or poorly maintained your battery may die on a regular basis. If your battery is old or weak it will not hold a full charge well.

Using some alligator clamps and a multimeter big mess o wires figured out much the usb charger draws in standby mode then figured out what effect if any it d have on a car s battery. If the test light is lit with all accessories turned off and the doors are shut so that the dome light will not come on than you have a drain. If the car is turned off just as with the lights inside the car the cell phone charger is drawing power from the car s battery. So depending on phantom load of the charger it could drain the battery enough that it cannot start the car or even completely drain it.

You should generally replace your car battery every 3 4 years. Even when it is not charging anything leaving the phone charger plugged in may drain the car battery and may deplete its power if the engine is not running which could leave you stranded or make for an. If your car consistently won t start it s possible that the battery is worn out.