How many amps can you get from a cigarette lighter?
For example a car cigarette lighter fuse has 15 Amps and most cars uses a 12V system, you take 15 and multiply it by 12 and you get 180 Watts which is your safety zone.
Most car battery chargers only charge a few amps, this can be provided easily through the lighter socket. The cigarette lighter is not designed for reverse current flow and they're fused for one like 15 amps max. You could blow out the socket's internal fuse, or burn up your ignition switch, or burn up the ACC relay.
- The only way to determine if your battery is good is to charge it first and then “load test” it. A Jump Starter is NOT A BATTERY CHARGER and it DOES NOT RE-CHARGE your vehicle's battery. A Jump Starter can be used anywhere. They merely act as a “substitute battery” for starting a vehicle when its battery is “dead”.
- Step 3: With both cars off and in Park, connect the jumper cables in the following order:
- (1) Connect one red clamp to the positive (+) battery post of the "dead" battery.
- (2) Connect the other red clamp to the positive (+) post of the good battery.
- Some cars with automatic transmissions are also equipped with a tow/haul mode that can come in handy. However, if you're towing off-road on uneven ground, manual transmissions can trump automatic ones. This is because towing large loads with a manual can damage the clutch from shifting gears.
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. However, new car chargers have safeguards, such as the ZUS® Smart Car Charger, which can cut off charging when your devices' are fully charged.
- 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. However, new car chargers have safeguards, such as the ZUS® Smart Car Charger, which can cut off charging when your devices' are fully charged.
- Now a battery's amp-hour capacity diminishes as the amperage draw increases, so you're looking at more realistically between 4 and 7 hours.
In terms of how long until you can't start the car, assuming the car battery is fully charged probably 45 to 90 minutes.
- Defective alternator diode. A car alternator recharges the battery and powers certain electrical systems. If your alternator has a bad diode, your battery can drain. The bad diode can cause the circuit to charge even when the engine is shut off, and you end up in the morning with a car that won't start.
Updated: 17th October 2019