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That is normal for any car. You are not giving the altenator enough time to properly charge the battery. So you are always running on a partially discharged battery. To make things worse since you only drive it every few days you have a slight parasitic drain on the battery. Things like your clock the radio and ecm all take a slight draw to keep the memory alive. Which is not a problem for a daily driver or even ocassional driver. But compound that your drives are only short trip low rpm and have no high speed freeway driving the alternator cant properly charge the battery. You have really 3 options at this point. One is drive the car more or on the weekend take it on the freeway say drive someplace little ways out of town for dinner or to go to the mall to help recharge the battery. You can get a battery tender. Google it you will find lots of diferent kinds for sale. Which is basically a minature solar cel that has a wire that plugs into your cigarette lighter and uses the sun to do a slight trickle charge to offset the slight draw. Lots of car dealers use these cause their cars sit on the lot for weeks a time and are only driven short trip for test drives. Or you can get a deep cycle battery such as optima yellow top which can withstand being completely discharged and recharged without killing it such as a oem battery.
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