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My 2015 Crosstrek has two 12V batteries. Do I need to put a battery tender on both of them when we are away for 4 months?
 

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My 2015 Crosstrek has two 12V batteries. Do I need to put a battery tender on both of them when we are away for 4 months?
I'm new to Subaru. Why two batteries? Are they connected in parallel to give you more available amperage? If so I wouldn't think you would need a charger on both since they are connected???
 
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