The Ford Barn

3twinridges · 12-10-2019, 02:17 PM

On a 6V optima redtop battery, what should the testing voltage be on a 100% charged battery?

JB

Black Fifty · 12-10-2019, 02:24 PM

6.3 volts. 2.1 per cell.

leon bee · 12-10-2019, 02:54 PM

6.3 here also.

3twinridges · 12-10-2019, 03:15 PM

My charger shot it up to about 7.0v and still showed charging not complete.

JB

philipswanson · 12-10-2019, 03:49 PM

That sounds fine. Right after charging the voltage will be higher. After charging, let it sit for a few hours, then take a reading. Use a quality fully automatic charger not a cheap one with constant amps.

3twinridges · 01-05-2020, 09:42 PM

Sponsored Links (Register now to hide all advertisements)

Got it figured out. My harbor freight multimeter was over a bolt off. Bought a good quality one and I am at 6.3. Thanks

JB

Dave/Green Bay · 01-05-2020, 09:52 PM

What type of charger do you use? Dave/Green Bay

3twinridges · 01-05-2020, 09:55 PM

It’s a schumacher 6v charger/maintainer.

JB

drolston · 01-06-2020, 02:01 PM

Most of these smart chargers are too smart for their own good. Like if a battery gets completely discharged, they will indicate failed battery and not even try to start charging. I use an ancient Western Auto trickle charger to get the things started, and then hook up the smart one.

Black Fifty · 01-06-2020, 05:41 PM

Very good point about the "smart" chargers. I've had the same experience.

FL&WVMIKE · 01-07-2020, 11:55 AM

I've had the best luck NOT keeping these batteries on the trickle charger (Battery Tender) 100% of the time. I'll put the charger on for a day or so once every month or so, but leave it at that. I think leaving AGM batteries such as the Optima on chargers 24/7 is bad for them.

I have a 12V Optima in the mustang that still works great... and is dated 02/06

Good Luck

blucar · 01-07-2020, 12:43 PM

I have used a "Battery-Tender" on several of my batter's, for many years, including AGM and/or Optama's, never had what I would call a failure. I did have a problem if I left the 'Tender' disconnected to long.

supereal · 01-07-2020, 04:03 PM

We use the Battery Tender all winter. It keeps our Optima batteries ready for the next drive. Most of our Optimas last years with no problems. Glass Mat batteries require low charging rates to prevent damage.

JSeery · 01-07-2020, 05:06 PM

Battery charge table:

solidaxle · 01-09-2020, 01:10 PM

I have had good results with this one

3twinridges · 01-10-2020, 06:10 AM

I am going to return the battery I think. I can’t get the battery to hold a charge. It dropped from 6.36 volts to 6.0 volts overnight. I think it has a bad cell.

JB

4dFord/SC · 01-11-2020, 04:33 PM

Quote:

Originally Posted by 3twinridges

I am going to return the battery I think. I can’t get the battery to hold a charge. It dropped from 6.36 volts to 6.0 volts overnight. I think it has a bad cell.

JB

My Optima typically shows 5.87 volts after sitting for awhile, but it always starts the car.

12-10-2019, 02:17 PM	#1
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Optima 6V battery charge On a 6V optima redtop battery, what should the testing voltage be on a 100% charged battery? JB

12-10-2019, 02:24 PM	#2
Black Fifty Senior Member Join Date: Oct 2018 Location: The Thumb of Michigan Posts: 107	Re: Optima 6V battery charge 6.3 volts. 2.1 per cell.

12-10-2019, 02:54 PM	#3
leon bee Senior Member Join Date: May 2017 Location: Arkansas Posts: 611	Re: Optima 6V battery charge 6.3 here also.

12-10-2019, 03:15 PM	#4
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Re: Optima 6V battery charge My charger shot it up to about 7.0v and still showed charging not complete. JB

12-10-2019, 03:49 PM	#5
philipswanson Senior Member Join Date: Oct 2015 Location: Bonita, CA Posts: 1,374	Re: Optima 6V battery charge That sounds fine. Right after charging the voltage will be higher. After charging, let it sit for a few hours, then take a reading. Use a quality fully automatic charger not a cheap one with constant amps.

01-05-2020, 09:42 PM	#6
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Re: Optima 6V battery charge Sponsored Links (Register now to hide all advertisements) Got it figured out. My harbor freight multimeter was over a bolt off. Bought a good quality one and I am at 6.3. Thanks JB

01-05-2020, 09:52 PM	#7
Dave/Green Bay Senior Member Join Date: May 2010 Location: Green Bay Posts: 391	Re: Optima 6V battery charge What type of charger do you use? Dave/Green Bay

01-05-2020, 09:55 PM	#8
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Re: Optima 6V battery charge It’s a schumacher 6v charger/maintainer. JB

01-06-2020, 02:01 PM	#9
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: Optima 6V battery charge Most of these smart chargers are too smart for their own good. Like if a battery gets completely discharged, they will indicate failed battery and not even try to start charging. I use an ancient Western Auto trickle charger to get the things started, and then hook up the smart one.

01-06-2020, 05:41 PM	#10
Black Fifty Senior Member Join Date: Oct 2018 Location: The Thumb of Michigan Posts: 107	Re: Optima 6V battery charge Very good point about the "smart" chargers. I've had the same experience.

01-07-2020, 11:55 AM	#11
FL&WVMIKE Senior Member Join Date: May 2010 Location: Daytona Beach, Fl & Spencer, W. Va, Posts: 4,442	Re: Optima 6V battery charge I've had the best luck NOT keeping these batteries on the trickle charger (Battery Tender) 100% of the time. I'll put the charger on for a day or so once every month or so, but leave it at that. I think leaving AGM batteries such as the Optima on chargers 24/7 is bad for them. I have a 12V Optima in the mustang that still works great... and is dated 02/06 Good Luck __________________ Mike Jr. here. I get on here every few months to check messages, and look through his almost 500 saved messages for information on the '29 and '34 I still have. A lot of very nice people on here. He truly enjoyed Ford Barn.

01-07-2020, 12:43 PM	#12
blucar Senior Member Join Date: Jul 2010 Location: Ventura, CA Posts: 2,464	Re: Optima 6V battery charge I have used a "Battery-Tender" on several of my batter's, for many years, including AGM and/or Optama's, never had what I would call a failure. I did have a problem if I left the 'Tender' disconnected to long. __________________ Bill.... 36 5 win cpe

01-07-2020, 04:03 PM	#13
supereal Senior Member Join Date: Jul 2014 Location: Iowa Posts: 1,634	Re: Optima 6V battery charge We use the Battery Tender all winter. It keeps our Optima batteries ready for the next drive. Most of our Optimas last years with no problems. Glass Mat batteries require low charging rates to prevent damage.

01-10-2020, 06:10 AM	#16
3twinridges Senior Member Join Date: Dec 2015 Posts: 547	Re: Optima 6V battery charge I am going to return the battery I think. I can’t get the battery to hold a charge. It dropped from 6.36 volts to 6.0 volts overnight. I think it has a bad cell. JB

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