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Try to charge the battery to a full charge with the battery charger. The alternator will charge it to full capacity after the car is running, but it is a little hard on the alternator. Newer vehicles are very demanding on the electrical system, which is supplied by the alternator, and it works the alternator very hard to run the vehicle and charge the battery all at once.
Any size of battery charger will charge the battery. A good slow charge is the best for the battery.
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