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Leaving Batteries in an Unplugged Charger
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Aug 5, 2022 14:51:18   #
jerryc41 Loc: Catskill Mts of NY
 
If you leave a battery in a charger that isn't plugged in, will the charger drain the battery? This topic was discussed in 2019, and the conclusion was: It depends. Time for a test.

I charged two Wasabi batteries (brand new) for my Z fc in a Wasabi dual charger. I checked the voltage, and one showed 8.43, while the other was at 8.41v. That's out of a nominal 7.6v. I put the 8.41v back into the unplugged charger, and I'll check the voltage on each one every day.

Boy, is this exciting!

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Aug 5, 2022 15:17:40   #
gmontjr2350 Loc: Southern NJ
 
I'm on the edge of my seat!

George

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Aug 5, 2022 15:25:09   #
flathead27ford Loc: Colorado, North of Greeley
 
jerryc41 wrote:
If you leave a battery in a charger that isn't plugged in, will the charger drain the battery? This topic was discussed in 2019, and the conclusion was: It depends. Time for a test.

I charged two Wasabi batteries (brand new) for my Z fc in a Wasabi dual charger. I checked the voltage, and one showed 8.43, while the other was at 8.41v. That's out of a nominal 7.6v. I put the 8.41v back into the unplugged charger, and I'll check the voltage on each one every day.

Boy, is this exciting!
If you leave a battery in a charger that isn't plu... (show quote)


I think I wet myself in so excited! LOL

Reply
 
 
Aug 5, 2022 15:32:23   #
Longshadow Loc: Audubon, PA, United States
 
It would depend on the design of the charging circuitry, whether the circuitry is a load on the battery and how much.
eg. Reverse leakage on a diode is only micro-amps.

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Aug 5, 2022 17:09:28   #
MadMikeOne Loc: So. NJ Shore - a bit west of Atlantic City
 
jerryc41 wrote:
If you leave a battery in a charger that isn't plugged in, will the charger drain the battery? This topic was discussed in 2019, and the conclusion was: It depends. Time for a test.

I charged two Wasabi batteries (brand new) for my Z fc in a Wasabi dual charger. I checked the voltage, and one showed 8.43, while the other was at 8.41v. That's out of a nominal 7.6v. I put the 8.41v back into the unplugged charger, and I'll check the voltage on each one every day.

Boy, is this exciting!
If you leave a battery in a charger that isn't plu... (show quote)


Jerry, you have waaayyyy too much time on your hands. Please come down here & help my husband clean out & organize our shed and garage.

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Aug 5, 2022 17:31:50   #
Ollieboy
 
Deleted

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Aug 5, 2022 18:29:23   #
13
 
Longshadow wrote:
It would depend on the design of the charging circuitry, whether the circuitry is a load on the battery and how much.
eg. Reverse leakage on a diode is only micro-amps.



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Aug 5, 2022 19:14:12   #
DaveO Loc: Northeast CT
 
Sounds like most here have no idea…

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Aug 5, 2022 19:35:49   #
Longshadow Loc: Audubon, PA, United States
 
DaveO wrote:
Sounds like most here have no idea…

Sounds like you have a real good grasp on most forums.

But wait, a well known (on the internet) photographer said.....
(Doesn't matter if he has no electrical background, does it.)

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Aug 5, 2022 20:06:52   #
DaveO Loc: Northeast CT
 
Longshadow wrote:
Sounds like you have a real good grasp on most forums.

But wait, a well known (on the internet) photographer said.....
(Doesn't matter if he has no electrical background, does it.)


Is that your final answer?

Lifeline?

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Aug 5, 2022 20:18:22   #
Longshadow Loc: Audubon, PA, United States
 
DaveO wrote:
Is that your final answer?

Lifeline?

Nah, my initial answer was my final answer.
"It depends."

Reply
 
 
Aug 5, 2022 20:55:00   #
DaveO Loc: Northeast CT
 
Longshadow wrote:
Nah, my initial answer was my final answer.
"It depends."


Bet you get a charge out of it!

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Aug 5, 2022 21:58:37   #
bikinkawboy Loc: north central Missouri
 
Now if you REALLY want your audience waiting with bated breath, test the voltage with a load. The way you tell a good battery from a bad one is to put a load on it. A good one will have lower voltage, but the voltage on a bad one drops considerably.

Think of your spare tire in your car. You pull it out of the trunk and it appears to be fully inflated. Put it on, lower the jack and with the load on it, it’s half flat.

Same thing with electricity. Electrical voltage is electrical pressure.

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Aug 5, 2022 22:11:05   #
sebottino
 
Good evening Jerry, from my experience with rechargeable batteries in the power tool field it does not matter what device you leave them in, they will generally loose 1 to 2 percent of their charge over a 24 to 48 hour period. The amount of charge they will loose depends on the ambient temperature of the place where they are being stored. Warmer places increases the voltage loss while cooler places reduces the loss. I'd be interested to see what results your experiment produces.

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Aug 6, 2022 06:20:47   #
Manglesphoto Loc: 70 miles south of St.Louis
 
jerryc41 wrote:
If you leave a battery in a charger that isn't plugged in, will the charger drain the battery? This topic was discussed in 2019, and the conclusion was: It depends. Time for a test.

I charged two Wasabi batteries (brand new) for my Z fc in a Wasabi dual charger. I checked the voltage, and one showed 8.43, while the other was at 8.41v. That's out of a nominal 7.6v. I put the 8.41v back into the unplugged charger, and I'll check the voltage on each one every day.

Boy, is this exciting!
If you leave a battery in a charger that isn't plu... (show quote)


Jerry' like others have said it's a crapshoot some chargers will discharge the batteries if left in a charger that IS NOT plugged in, I have had this happen numerous times a large battery chargers with a timer that shut off and the night shift left running. A real bad idea.

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