battery dead after sitting 3-4 weeks. what is best way to recharge? on 2001 BMW X5

battery less than 1 year old would leaving on a trickle charger help ?

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2 answers
Check your ac/heater fan rester control this cause my x5 battery to go down after sitting.
charge it a little bit on the charger and then if you want you can have someone jump start it. also have someone checkout what is using the battery when you leave the car off.