The battery tests produce false positives ( good battery) do to the new design that relies on a mathematical equation to calculate if the battery is good or not. The old testers use to put a load test on the battery to test it and it was fool proof but change ushered in and now people are replacing part after part for nothing more then a bad battery testing good. The age of your battery is approaching the life expectancy of batteries in our jeeps anything over 4 years is a gift of good will and good luck. Not with standing that point on it's own putting a charger on and having your issue solved is basic 101 mechanics the battery is having trouble(why?). Were getting into that transitional period of weather again folks, cold nights warm days just reeking havoc on batteries and exposing all there weaknesses. This is the time of year that battery issues start flooding all the forums LOL. 3 years is a little early to have a bad battery but considering you put a charge on it and your problem went away leads you in two directions, alternator or battery. Alternator is a easy check just drop you meter on there and measure what it is putting out. The battery well, that's a different story. The only true way IMO to test it is to test it under a load...... No fancy math involved put a load on it and see how long it holds the amps period.
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