Parasitic drain of usb chargers - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 18 Old 07-05-2016, 08:47 PM Thread Starter
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Parasitic drain of usb chargers

Ok so I bought this nice 12v plug/usb charger https://amzn.com/B00VF7HZF0 to replace the battery tender usb charger. Now I've let the battery tender one plugged in for at least 2 weeks and there was no issue starting the bike

As you can see the parasitic drain is not that bad


But this new one is three time worse


So how long can I go with this drain without having issue starting the bike?

Yes I'm already looking into a solution with a relay to prevent the loss, but I'm curious to know.

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post #2 of 18 Old 07-05-2016, 11:01 PM
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It's best not to recharge parasites. They just keep demanding more.
My power outlets don't draw anything until I plug in a parasitic device, like my phone or GPS and over night it still didn't kill my battery.
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post #3 of 18 Old 07-05-2016, 11:52 PM
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Use an on-off switch? There's no reason to leave an accessory outlet on an always hot circuit.

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post #4 of 18 Old 07-05-2016, 11:59 PM
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I was wondering about this when I rigged up my new Garmin power cable and a red light came on for the voltage adapter. I've since moved it to the switched side of the Eastern beaver PC8 I just installed. The only thing I now have directly connected to the battery is the Warm-n-Safe harness.

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post #5 of 18 Old 07-06-2016, 04:11 AM
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I always put electronics that use any amount of mAh on switched power....

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post #6 of 18 Old 07-06-2016, 09:08 AM
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"I always put electronics that use any amount of mAh on switched power...."

That's a great suggestion.
Problem is that it's so easy to not use a isolating relay from switched power.
That irritating task of removing the body work and doing a proper job of it is a hurdle some of us haven't yet cleared.
I'm so ashamed of me!
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post #7 of 18 Old 07-06-2016, 09:08 AM Thread Starter
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hehe yes that's what I'm saying, I'll be installing a relay to power the unit, but I'm curious to know how much power the bike need to start. The batt I have is rated at 12A/h, so if I use half of it will the bike start?

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post #8 of 18 Old 07-06-2016, 09:40 AM
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That drain will kill a Lithium battery over time..ask me how I know


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post #9 of 18 Old 07-06-2016, 10:10 AM
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Quote:
Originally Posted by marcham View Post
Use an on-off switch? There's no reason to leave an accessory outlet on an always hot circuit.

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Sure there is..........

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post #10 of 18 Old 07-06-2016, 10:39 AM
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Quote:
Originally Posted by Big B View Post
Sure there is..........
Right. I have my GPS unswitched into my Eastern Beaver PC8 so it doesn't power off at gas/rest stops. If I have to step away from the bike, the Zumo goes into the locked top case or my pocket.
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