No, it won’t drain overnight if you disconnect the positive lead. However, it’s very bad practice & can be dangerous, assuming the car is negative earth/ground. NB: Just about every car built since about 1965 is negative Earth. Disconnect the negative terminal.
How long can you leave a car battery disconnected?
When the battery is removed, it can stay for six weeks to 6 months. However, you need to keep recharging the battery over time. Ideally, the battery should be recharged every 12 weeks when the battery is disconnected.
Is disconnecting your car battery bad?
WARNING: Regardless of the year, make or model of vehicle NEVER disconnect the battery while the engine is running or the ignition key is on. Doing so can create a high voltage spike in the electrical system that may damage electronic modules and/or the charging system.
Should I disconnect battery if car parked long term?
When you disconnect your car battery from the car, it helps prevent the electrical systems including the clock and on-board computer system from draining it completely. Therefore, if you leave the car battery unattended for longer period, then it might damage the battery and even need replacement.
Does disconnecting a car battery save power?
Disconnecting your battery from your car before you leave could potentially save you from having to replace it with a brand new one when you return. … “Some of these new cars have so many electronics and modules, the battery could get drained in a matter of weeks if left alone,” he said.
Will a battery lose charge if disconnected?
Disconnecting the battery leads, will ensure that the battery does not discharge due to any connected load. That load may small (ICE which is waiting for the remote’s signal, Anti theft devices, Clock or even ECU), but over time it will discharge the battery.