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Even though you turn "OFF" the "BATTERY DISCONNECT" switch, there are parasitic drains on the battery. This is why it drains. Lithium batteries have almost zero internal drain. This means once charged they will stay charged for a LONG time. I believe they recommend charging lithium batteries to 80% for storage.
I put a cut off switch on the positive cable coming out of the battery box before it reaches the first red self resetting circuit breaker mounted on the wall.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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