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  #11  
Old 06-08-2021, 10:58 AM
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I never unplug my phone adapters and actually really glad the diff lighters are always powered. Very often my phone needs a charge when I'm parked.

I think I would rather have a switch to power off when car isn't driven for week or more at a time.
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  #12  
Old 06-08-2021, 01:18 PM
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Quote:
Originally Posted by wpoll View Post
It's likley to be enough to flatten your battery after a week or so... hence wiring them to a switched source, then it doesn't matter.

I don't think that would be the cases, wpoll... Typically those chargers will only draw about 10-20 milliamps (at 12v) when not plugged in, and only if they have an LED light that stays on all the time. If they don't have a light, then it will draw basically no current at all. The leakage current is technically not zero when it's not charging, but it's negligible (1mA range).



I think our E53 battery is something like 92 amp-hours, so if it did pull 20 mA then it would take a lot more than a week to discharge a healthy battery to the point where it couldn't start the car... it would probably be 6-12 weeks before the battery would even be weakened by these alone. The car probably represents a much greater standby drain. Just my $0.02.
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  #13  
Old 06-08-2021, 04:28 PM
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Great idea!

Do you have any photos of it installed?
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  #14  
Old 06-08-2021, 07:05 PM
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Quote:
Originally Posted by Bdc101 View Post
I don't think that would be the cases, wpoll... Typically those chargers will only draw about 10-20 milliamps (at 12v) when not plugged in, and only if they have an LED light that stays on all the time. If they don't have a light, then it will draw basically no current at all. The leakage current is technically not zero when it's not charging, but it's negligible (1mA range).



I think our E53 battery is something like 92 amp-hours, so if it did pull 20 mA then it would take a lot more than a week to discharge a healthy battery to the point where it couldn't start the car... it would probably be 6-12 weeks before the battery would even be weakened by these alone. The car probably represents a much greater standby drain. Just my $0.02.
I made the same conclusions (assumptions) as you - BUT, I have a work colleague that lost his battery via a plug-in (cig. lighter socket) USB adapter. Took well less than a week to total a good battery (down to ~4v)

I have yet to test the current draw but I suspect that some of these adapters/converters are low draw and some are VERY high!

It would pay to actually measure the draw when fitting these things...
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  #15  
Old 06-08-2021, 07:17 PM
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That's probably a very good recommendation.



Also, buying anything off Amazon is probably a bad idea. Amazon is basically a fully-complicit partner of the chinese knock-off industry at this point.
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  #16  
Old 06-11-2021, 07:25 AM
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Excellent idea and excellent write up. Thanks!
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