Quote:
Originally Posted by jarnojvv
Your vehicles charging system was not designed to bring a flat dead battery back to life. No amount of driving will fully recharge a dead battery. Idling the engine for periods of time will not help either. Surface charging or continuous undercharging will lower the capacity of the battery over time and deep discharges can damage batteries and will shorten their lives. When a dead battery needs to be recharged, the only way to reliably restore it is to use an appropriate multi-stage battery charger. The charger voltage needs to be high enough to mix the battery acid evenly in the electrolyte to prevent ‘stratification’. You will also save wear and tear, and fuel by using a charger to restore the battery to its maximum charge.
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I used to own a decent battery charger / conditioner however moved house recently and it was thrown out by someone who knows better and must be obeyed.