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#2508012 - 06/13/18 03:10 PM New Battery purchase 12.3v 50% charged
mopars4ever Offline
I Live Here

Registered: 01/20/03
Posts: 11094
Loc: md
I just bought a deep cycle battery from advance auto. It is dated 2/18 so I assume it has sat on the shelf since then without a charge. Anyways as soon as got home I checked it. It was 12.3v . Then hooked it up to my good Optima battery charger and it said the battery was 50%. Should I return it?

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#2508016 - 06/13/18 03:18 PM Re: New Battery purchase 12.3v 50% charged [Re: mopars4ever]
Rhinodart Offline
Rhinotruck

Registered: 01/20/03
Posts: 36664
Loc: Round Lake Beach, Illinoisy
Let it charge overnight then check again. twocents
_________________________
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

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#2508065 - 06/13/18 04:36 PM Re: New Battery purchase 12.3v 50% charged [Re: mopars4ever]
mopars4ever Offline
I Live Here

Registered: 01/20/03
Posts: 11094
Loc: md
Ok, I`ll check it again tomorrow.

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#2508078 - 06/13/18 05:01 PM Re: New Battery purchase 12.3v 50% charged [Re: mopars4ever]
Rhinodart Offline
Rhinotruck

Registered: 01/20/03
Posts: 36664
Loc: Round Lake Beach, Illinoisy
Just put it on a low amperage, 2-5 amps is all you need.
_________________________
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!

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#2508127 - 06/13/18 07:21 PM Re: New Battery purchase 12.3v 50% charged [Re: Rhinodart]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 31224
Loc: Bend,OR USA
Originally Posted By Rhinodart
Just put it on a low amperage, 2-5 amps is all you need.
iagree
I charge my two deep cycle group 24 Marine-RV batteries in my bracket car for two or three days in advance of racing it with a 4 amp charger scope
I let it sit overnight so the battery will cascade down to their steady state voltage scope I don't rely on peak voltage coming off the charger work
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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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#2508244 - 06/14/18 01:01 AM Re: New Battery purchase 12.3v 50% charged [Re: mopars4ever]
jbc426 Offline
master

Registered: 03/01/07
Posts: 2768
Loc: West Coast, USA
I've always heard all new batteries should be charged at a low amperage on an automatic charger overnight. AGM batteries require a special charger, but it sounds like you have that covered.

Throwing a low charged battery in your car and relying on your alternator to charge it is very hard on your alternator's bridge diodes.
_________________________
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 3.73s
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 3.91's (closest thing to an automatic 5 speed going)

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#2508273 - 06/14/18 06:49 AM Re: New Battery purchase 12.3v 50% charged [Re: mopars4ever]
360view Offline
master

Registered: 01/18/06
Posts: 4461
Loc: USA
Some deep cycle battery designs use a slightly weaker electrolyte in order to get longer life from the plates.

Just like hotter outside temperatures will make the electrolyte expand ( lower Specific Gravity) and the full charge voltage drop slightly, a weaker new fill of electrolyte also makes the full charge voltage less.

The various designs of lead acid batteries can have fully charged voltages ranging from 12.4 up to 13.2 volts.

AGM designs tends lower.
Calcium or Atimony as an alloy in the lead affects voltage.

Charging up a new battery at low amps for more than 24 hours is good practice, let it sit to cool down, then measure both resting voltage and electrolyte SG to know the new baseline numbers to judge when future charging is complete.

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