I have a 2 post Battery Tender I've used for several years. I NEVER leave it on all winter. I have 7 batteries I rotate every 2 months. Once the green light is solid, I leave the charger for another 2 days and then move to another battery. After they have all been charged, they sit for 2 months. These batteries range in age 6-9 years old now.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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