We've all been there mate As I said earlier the beauty of a intelligent type charger is they never let you down and as long as you park your jeep near a power source you will always know you have a fully charged battery, I have used one on a condemned battery my friend gave me for my sheep electric fencer after it failed several times to hold a charge, after being on the Optimate it is now holding charge and I used it on my own car for a couple of weeks when mine failed ! They have the ability to reclaim batteries thought to be useless. Well worth the investment, like a jeep ! :-)