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#4689639 - 03/09/18 01:46 PM Charge New Battery?
Old Mustang Guy Offline


Registered: 11/16/05
Posts: 971
Loc: Rockwall, Texas
My wife bought a new Highlander just two weeks ago. I have read here that charging a battery can make it last longer. Last night I put my charger on her battery. I was shocked that it only showed 50 percent charge. Could sitting on a lot cause this? She had taken one trip of about 50 miles. It showed full charge after about 4 hours on 4 amps.

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#4689642 - 03/09/18 01:49 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35975
Loc: Great Lakes
Depending on your particular charger, the reported "only 50%" charge state may be misleading. But it is possible that the battery got depleted quite a bit during extended sitting if the dealer did not keep it topped off. Modern car electronics do eat up batteries faster.
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#4689643 - 03/09/18 01:51 PM Re: Charge New Battery? [Re: Old Mustang Guy]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17932
Loc: PNW
A battery will slowly discharge if a vehicle isn't driven. How much depends on the slight draw going on while sitting. When I park my car for winter it gets the battery tender put on every 2~3 weeks to keep the battery fully charged.

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#4689648 - 03/09/18 01:59 PM Re: Charge New Battery? [Re: Old Mustang Guy]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
What was the actual resting voltage. I've got a smart charger and I don't trust its initial reading. For instance, it will indicate somewhere around 90% charged after I just charged it, after turning the headlights on for a minute. As soon as it charges, it goes very quickly to high 90's and then 100%.

I believe I was told before that specific gravity is a better way of determining state of charge. Is that right?

Finally, yes, a battery can deplete while on the lot, both due to parasitic drain, starting and stopping the engine quickly while moving it around the lot, or while people hop in to check it out, but not test-drive it.

I've seen new cars with the plastic still on them need to be jumped after possibly being subjected to the above.

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#4689660 - 03/09/18 02:17 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Kestas Offline



Registered: 06/04/02
Posts: 12400
Loc: The Motor City
I charge every new battery I buy. I trickle charge 2 amps for up to two days.

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#4689668 - 03/09/18 02:23 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Eddie Offline


Registered: 12/07/03
Posts: 9658
Loc: Florida, Cape Coral
I charge every new batter with a battery minder or trickle charger. Ed
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#4689675 - 03/09/18 02:33 PM Re: Charge New Battery? [Re: Old Mustang Guy]
SatinSilver Offline


Registered: 01/24/08
Posts: 10342
Loc: OH
If you charge it up you'll be in the less than 1% crowd that does such a thing.

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#4689677 - 03/09/18 02:34 PM Re: Charge New Battery? [Re: Old Mustang Guy]
wrcsixeight Offline


Registered: 10/15/10
Posts: 1752
Loc: california
The state of charge reading on so called 'smart' chargers, is based solely on the voltage it sees from the battery when first hooked up and plugged in.

This number can be wildly inaccurate depending if the battery was just charged or discharged and the battery itself. I have an AGM which fully charged rests at 13.06v. I have a flooded battery which rests fully charged at 12.67v

All lead acid batteries want to be kept cool and fully charged, always.

A temperature compensated hydrometer sampling the specific gravity of a 12v battery's 6 cells is quite accurate as to state of charge, an batteries whose electrolye can be accessed, but Specific gravity can vary from battery to battery from 1.260 to 1.310, so a baseline for comparison is needed.

Most smart chargers actually stop charging the battery at about 92 to 95% charged, and drop to a float/ maintenance voltage. Charging does still occur at these lesser electrical pressures but it is much much slower and aged batteries might never reach 100% charged at these lesser voltages, no matter how long the float voltage is applied.

92 to 95% charged can be 'just fine' for most, but a true 100% achieved regularly would have the battery last significantly longer.
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#4689779 - 03/09/18 04:33 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Donald Offline


Registered: 03/21/04
Posts: 20566
Loc: Upstate NY
I think it probably needed charging, but reading from charger is suspect.
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#4689780 - 03/09/18 04:33 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Old Mustang Guy Offline


Registered: 11/16/05
Posts: 971
Loc: Rockwall, Texas
Thanks. I suspect the 50 percent was an error but it did take a significant charge. I've learned a lot about batteries here.

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#4689787 - 03/09/18 04:38 PM Re: Charge New Battery? [Re: Old Mustang Guy]
gathermewool Offline


Registered: 01/09/09
Posts: 6064
Is the charger putting out 4A the whole time? Even if it did, I wouldn't consider 16A-Hrs to be significant. That may be only 25% or less depleted.

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#4689797 - 03/09/18 04:53 PM Re: Charge New Battery? [Re: Old Mustang Guy]
Chris142 Online   content


Registered: 06/05/03
Posts: 16976
Loc: Deplorable in apple valley, ca
I always charge a new one. I have some for sale at work. I put them on a charger once a month or so.
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#4689807 - 03/09/18 05:00 PM Re: Charge New Battery? [Re: Quattro Pete]
y_p_w Offline


Registered: 05/06/05
Posts: 3650
Loc: SF Bay Area
Originally Posted By: Quattro Pete
Depending on your particular charger, the reported "only 50%" charge state may be misleading. But it is possible that the battery got depleted quite a bit during extended sitting if the dealer did not keep it topped off. Modern car electronics do eat up batteries faster.


It's somewhat useful having a reading like that, but for the most part it's only a rough estimate. When you start it up all that it really has is a voltage reading that it's correlating with expected charge percentage. I've got one myself (a Schumacher SC-1200A-CA) and I take those readings with a grain of salt. You get a surface charge that will go away overnight. I mean - I can try to top it off in the morning after fully charging it the night before, and it's reading 80-85%.

Now I do believe that the voltage reading when it's not charging should be accurate. I'm not sure it's terribly practical to charge batteries on the lot. Now I suppose a good thing to do would be to charge up the battery while it's being prepped for the customer with something like a wheeled shop charger.

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#4689810 - 03/09/18 05:06 PM Re: Charge New Battery? [Re: Chris142]
y_p_w Offline


Registered: 05/06/05
Posts: 3650
Loc: SF Bay Area
Originally Posted By: Chris142
I always charge a new one. I have some for sale at work. I put them on a charger once a month or so.

How do you do it? I've just placed the clamps straight on the terminals, but then I checked my charger's manual for the recommended procedure. It recommended using a ground cable as an extension to avoid making the connection (and possibly sparking) right at the battery. When I connect it to the ground (my usual point is at a grounding wire on my wife's Civic) for normal in-vehicle charging I can see it spark.

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#4689813 - 03/09/18 05:06 PM Re: Charge New Battery? [Re: Old Mustang Guy]
raytseng Offline


Registered: 12/11/08
Posts: 2366
Loc: CA
standard toyota delivery checklist. Heres a link.
https://www.donvalleynorthtoyota.com/faq/pdi.htm

It includes checking state of charge of the battery.

New cars sitting on the lot sgoulf have batteries disconnected so the parasitic drain shouldnt be an issue

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