Just Enter Your Destination. Your Tesla automatically finds the best route and suggests charging stations along the way. Optimizes Route. Finds the best route to avoid traffic and charge if needed. Measures Battery. Gives real-time battery estimates based on your driving style. Recommends Chargers. Offers charging location recommendations along
General Charging Times. For the majority of BMW batteries, which typically range between 80-110Ah, here’s the scoop: From Empty to Full: If your battery's as drained as you after a Monday morning meeting, it'll take about 20 to 30 hours to charge it fully using a 4-6 ampere charger.
A 1 amp charger can take 60 hours to charge a completely dead battery. At 10 amps it can charge a 12-volt car battery in about 4 hours charging time. A 50 amp model can charge a truck battery in an 1 hour to 1.5 hours. The Largest 70 or 80 amp car battery chargers can charge a truck batter in less than an hour.
Typically, the charger supplies a constant current at slightly higher than the battery's voltage. As the battery voltage increases, the supplied voltage increases until it hits the maximum for the cell - typically 4.2V. Then, the voltage is kept constant and the current is reduced until it hits 3-5% and charging is considered done.

\$\begingroup\$ IF it is a 4S LiIon charger the battery is nominal 4x 3.6 = 14.4V BUT the charger will charge to a peak of 4.2 x 4 = 16.8V. SO follow it with a Constant voltage unit and it will charge to whatever CV you set. 13.7V is safe for floating a car battery, giving 2.4V headroom.

How to charge your battery: Set your battery charger based on your needs. Models vary, but most offer a “jumpstart” or “quick charge” mode for a speedy car battery charge, as well as a lower power, long-term charge mode designed to safeguard batteries and keep them in top shape.
Charging a 12 Volt battery from a cigarette lighter is a simple process. You need the correct devices to feed the power from the socket into the target battery in usable form. Like any 12 Volt battery, you can charge a deep cycle battery in a variety of ways. The most common of these is to use a battery charger.
Connect the negative (-) cable to the negative terminal on the working battery. Connect the other end of the negative cable to a metal surface on the engine block or frame of the car with the dead battery. Start the vehicle with the working battery and let it run for a few minutes.
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    • charging a battery with a charger