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3twinridges 12-10-2019 02:17 PM

Optima 6V battery charge
 

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

Re: Optima 6V battery charge
 

6.3 volts. 2.1 per cell.

leon bee 12-10-2019 02:54 PM

Re: Optima 6V battery charge
 

6.3 here also.

3twinridges 12-10-2019 03:15 PM

Re: Optima 6V battery charge
 

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

JB

philipswanson 12-10-2019 03:49 PM

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.

3twinridges 01-05-2020 09:42 PM

Re: Optima 6V battery charge
 

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

Re: Optima 6V battery charge
 

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

3twinridges 01-05-2020 09:55 PM

Re: Optima 6V battery charge
 

It’s a schumacher 6v charger/maintainer.

JB

drolston 01-06-2020 02:01 PM

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.

Black Fifty 01-06-2020 05:41 PM

Re: Optima 6V battery charge
 

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

FL&WVMIKE 01-07-2020 11:55 AM

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

blucar 01-07-2020 12:43 PM

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.

supereal 01-07-2020 04:03 PM

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.

JSeery 01-07-2020 05:06 PM

Re: Optima 6V battery charge
 

1 Attachment(s)
Battery charge table:

solidaxle 01-09-2020 01:10 PM

Re: Optima 6V battery charge
 

1 Attachment(s)
I have had good results with this one

3twinridges 01-10-2020 06:10 AM

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

4dFord/SC 01-11-2020 04:33 PM

Re: Optima 6V battery charge
 

Quote:

Originally Posted by 3twinridges (Post 1839786)
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.


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