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      11-19-2021, 09:21 PM   #9
Billfitz
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Drives: '15 328iX GT
Join Date: Jan 2015
Location: New Hampshire

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You don't need to spend that much for a maintainer. This is 1 amp, which is all that's required:
https://www.amazon.com/dp/B07W46BX31...NsaWNrPXRydWU=

You wouldn't want to use it to charge a dead battery, as it would take at least 3 days, but it provides more than enough juice to prevent the battery from discharging while the car's not being driven.
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