Bonesie I would suggest if the battery is around five years old or more then replace it for peace of mind. Allowing it to reach such a low state of charge over such a time will have taken a fair chunk out of whatever capacity remained. A full re-charge of remaining capacity will likely have you up and running again but for how long?
A lead/acid battery when new will naturally discharge at a rate of 4%/week, not taking into account any permanent loads from clock, radio, ECU, immobiliser etc. This rate of discharge will have an ever increasing effect as battery capacity reduces with ageing, which in turn can be offset by leaving the battery on a smart charger when not in use for more than a week or two.
Such batteries thrive by being used regularly, never discharged more than 10% of current capacity and left fully charged after use.
Last edited by Richard Wood; 21/12/20 10:05 AM.
