How Long Can A Disconnected Car Battery Last. Remove the positive terminal cable from the battery using your pliers or wrench. High voltage spike in the electrical system.
As to how long a battery can last while sitting idle that depends. Disconnecting the battery leads will ensure that the battery does not discharge due to any connected load. When the vehicle is not in use you can either keep the car battery in the vehicle or keep it separately.
Some have the ability to retain the code up to several hours after disconnection from the battery depending upon the vehicle model and computer capabilities.
Five minutes is not much of a charge and if the car is sitting a lot in the garage for a week here and a week there I would probably recommend getting a Battery Tender to keep the battery from sulfating. Those types of batteries examples are Northstar Odyssey and X2Power are usually substantially heavier than other types of batteries of an equivalent size but they often offer more capacity and some of them have self-discharge rate lower as 1 per month meaning that a fully charged battery can sit disconnected for 2 years and still have approximately 80 of its power available. The maximum lasting time of a car battery when removed is around 6 months. Consequently damaging electronic modules.
