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If Jump start a car how long run to fully charge the battery?

You can't fully charge a car battery by jump-starting it.

Here's why:

* Jump-starting provides a temporary boost: Jump-starting uses another car's battery to provide enough power to start the engine. It doesn't actually charge the dead battery.

* Charging requires a charging system: A car battery needs to be charged by the alternator (part of the car's charging system) while the engine is running.

Here's what you should do if your battery is dead:

1. Jump-start the car: Use jumper cables to start the car, but only drive it to a safe place to get the battery checked or charged.

2. Take it to a mechanic or auto parts store: They can test the battery and determine if it needs replacement or can be charged.

Note: It's best to avoid driving long distances after a jump-start as the battery might not have enough charge to handle the load.