Is it bad to charge your phone in your car? Well it could be. Imagine that you’ve got a bucket and you put the bucket in the sink and turn the water on. The bucket represents your battery. The water in the bucket represents how much power is in the battery, and the faucet pouring water into the bucket represents your alternator. There’s a certain rate that the power or water is going into the bucket.
If you plug a phone into your car, your phone is drawing more power out of your battery than your alternator can put into the battery, which will cause the battery to not fully charge and will make it not last as long. Here’s what you can do. You can get yourself one of these. This is a 5 watt charger. It will restrict the amount of power that your phone can draw, while still allowing your phone to charge causing your battery to last longer.