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Battery charging: How much driving after start? #4397844
05/06/17 03:15 PM
05/06/17 03:15 PM
Joined: Jun 2011
Posts: 77
Denmark, Europe
LucasDK Offline OP
LucasDK  Offline OP
Joined: Jun 2011
Posts: 77
Denmark, Europe
Hi,

Are there some general rules of thumb for:

When you start the engine, how many minutes do I need to drive the car in order to charge the battery to the charging state just before starting?

Lucas


Toyota Hiace 2,4D (2L engine)
Toyota Corolla AE92, (4A-FE engine)
Ford Model A (3,4 liter engine)
Re: Battery charging: How much driving after start? [Re: LucasDK] #4397857
05/06/17 03:26 PM
05/06/17 03:26 PM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
It would be impossible to give you a simple answer like you want. Starting doesn't take that much energy from a large battery, it's running accessories while the vehicle is off that brings the state of charge down.

It takes multiple hours to get the battery from 80-100%

The alternator will never fully charge the battery because it will not seek a high enough voltage for long enough to bring the specific gravity to the proper full range.

It's recommended to charge your battery on the grid with a quality charger every so often when you can maybe once a month or so.


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Battery charging: How much driving after start? [Re: LucasDK] #4397861
05/06/17 03:29 PM
05/06/17 03:29 PM
Joined: Sep 2004
Posts: 7,533
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,533
Marshfield , MA
Too many variables for thumb. The Rat mostly has a dead battery, but it starts easily. I can jump it from the BMW and drive less than 2 miles to shop and it restarts? The alternator is putting out 14.5 v, I've checked that with a meter. The Bosch alternator on the 528e is set to only 14.1 V. It would likely need a jump. I keep a battery charger on the premises.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Battery charging: How much driving after start? [Re: LucasDK] #4397863
05/06/17 03:30 PM
05/06/17 03:30 PM
Joined: Oct 2010
Posts: 1,770
california
wrcsixeight Offline
wrcsixeight  Offline
Joined: Oct 2010
Posts: 1,770
california
It depends on the voltage the vehicles voltage regulator allows, and how long it takes to crank the engine.

When my AGM battery is truly 100% charged, it accepts 0.0x amps at 14.7v

If I start my v8 engine at this 100% state of charge, when amps at 14.7v taper back to 0.0x, the battery is again fully charged.

This takes about 45 seconds on my vehicle.

Note that most batteries are not fully charged when the engine is started and most vehicle charging systems on their own will not really be able to accomplish a true 100% state of charge. It is best to use a plug in charging source to squeeze in those last few % which can take hours. The 100% charged lead acid battery is twice as happy as the 98% charged battery and will likely live twice as long.

Far too many people act like alternators defy the laws of physics, nearly instantly recharging batteries and are a 'free' energy source. They can't, Don't, and are not. Not even when chromed and polished and spoken to lovingly.

Re: Battery charging: How much driving after start? [Re: wrcsixeight] #4397875
05/06/17 03:54 PM
05/06/17 03:54 PM
Joined: Oct 2013
Posts: 1,442
Georgia
DeepFriar Offline
DeepFriar  Offline
Joined: Oct 2013
Posts: 1,442
Georgia
Originally Posted By: wrcsixeight


Far too many people act like alternators defy the laws of physics, nearly instantly recharging batteries and are a 'free' energy source. They can't, Don't, and are not. Not even when chromed and polished and spoken to lovingly.


Little known fact: This same law applies to women.

Re: Battery charging: How much driving after start? [Re: LucasDK] #4397884
05/06/17 04:06 PM
05/06/17 04:06 PM
Joined: Jun 2003
Posts: 33,110
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,110
ME
The emptier your battery, the faster it will return to the state it was before starting. Its internal resistance is less.

My gear reduction starter motor is rated for 1.5 hp which is about 1000 watts or 80 amps. So with a 100 amp alternator it'll theoretically fill back up within seconds.

If you do, say, a paper route, your battery will sink to about 75% state of charge but reach a "new normal" and not go lower as it's insanely easy to go from 74% back up to 75% after a start.

This isn't great for it as it will sulfate, so a nice long drive will get it to 95% and a shore power charge every six months would bring it to 100.

Re: Battery charging: How much driving after start? [Re: LucasDK] #4397931
05/06/17 05:07 PM
05/06/17 05:07 PM
Joined: May 2013
Posts: 680
Florida
SilverSnake Offline
SilverSnake  Offline
Joined: May 2013
Posts: 680
Florida
If you are concerned about the state of your battery in any vehicle, you need accurate information. I recommend the Midtronics PBT300. It will tell you the state of your battery in seconds both in terms of voltage and CCAs. I use mine to monitor the state of the batteries in my vehicles at least once per week. It will also easily test your charging and starting systems.

https://www.amazon.com/Midtronics-PBT300...ords=midtronics

If your driving habits are not keeping the batteries in your vehicles at the optimum level, then a good smart charger will take care of the problem. I use the CTEK Multi US 7002 although there are many satisfactory options. Simply hook up the charger overnight and in the morning your battery should be at the optimum level. Severely discharged batteries may take longer. A lot of car guys I know keep a CTEK hooked up to their cars any time they are not in use. This practice will make your batteries last longer than they would otherwise.

http://smartercharger.com/products/batterychargers/ctek-multi-us-7002/


2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: Battery charging: How much driving after start? [Re: LucasDK] #4397943
05/06/17 05:31 PM
05/06/17 05:31 PM
Joined: Mar 2004
Posts: 20,760
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,760
Upstate NY
With carburetors gone, most vehicles start right up and thus putting back into the battery what starting took out is done quickly. Obviously, headlights, defroster, heater fan may slow the process down. My pickup has a 1500w electric heater coil built into the heater system. I assume it consumes some power when it's on. For about 15 min after startup in cold weather.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Battery charging: How much driving after start? [Re: 901Memphis] #4398018
05/06/17 07:42 PM
05/06/17 07:42 PM
Joined: Dec 2014
Posts: 1,671
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,671
'murica
It's not recommended to put your battery on a charger every month. That's preposterous. liar

Re: Battery charging: How much driving after start? [Re: Ethan1] #4398023
05/06/17 07:48 PM
05/06/17 07:48 PM
Joined: Oct 2012
Posts: 4,632
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,632
Taiwan
Originally Posted By: Ethan1
It's not recommended to put your battery on a charger every month. That's preposterous. liar


They might not recommend it, because they know people wouldn't do it, so it'd [censored]-off the punters and so be bad commercial practice.

That doesn't mean it isn't good maintenance practice.

Re: Battery charging: How much driving after start? [Re: Ethan1] #4398025
05/06/17 07:49 PM
05/06/17 07:49 PM
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
901Memphis Offline
901Memphis  Offline
Joined: Aug 2010
Posts: 12,903
Northern Kentucky
Originally Posted By: Ethan1
It's not recommended to put your battery on a charger every month. That's preposterous. liar


I'd say at least a month if it's easy. If I had a garage with an outlet I'd be plugging up weekly


2012 Chevy Cruze LT 1.4T - 50k
2002 Buick Century 130k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
Re: Battery charging: How much driving after start? [Re: 901Memphis] #4398079
05/06/17 09:10 PM
05/06/17 09:10 PM
Joined: Apr 2004
Posts: 439
ON, Canada
yugrus Offline
yugrus  Offline
Joined: Apr 2004
Posts: 439
ON, Canada
Would it hurt to have the battery maintained by the on-board smart charger on daily basis? I have my Tahoe rigged with on-shore power that supplies electric interior heater, seat heaters, block heater, oil pan heater, transmission heater and battery smart charger. Everything is controlled through three wifi timers. Smart charger gets power before anything else does, and I've made a habit to plug the power cord in whenever I park in the driveway. So it is natural for me to at least power the charger up. Am I doing a favor to the battery when I let it charge/maintain for 10-15 hours daily, or do I hurt something?
I'm really sorry for possibly hijacking the thread, but I couldn't rssist.


'14 Chevrolet Tahoe
'15 Mazda CX-5
Re: Battery charging: How much driving after start? [Re: Ethan1] #4398085
05/06/17 09:28 PM
05/06/17 09:28 PM
Joined: Aug 2004
Posts: 4,646
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,646
Katy, Republic of Texas
Originally Posted By: Ethan1
It's not recommended to put your battery on a charger every month. That's preposterous. liar

Well, it was just recommended.
Topping off the battery monthly with a charger will give a lot of life to a battery.


2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI

Re: Battery charging: How much driving after start? [Re: LucasDK] #4398090
05/06/17 09:36 PM
05/06/17 09:36 PM
Joined: Dec 2016
Posts: 6,262
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,262
Waco, TX
Many people don't truly understand lead acid batteries.

No one here has even mentioned an "equalization charge" yet.......


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Battery charging: How much driving after start? [Re: LucasDK] #4398092
05/06/17 09:37 PM
05/06/17 09:37 PM
Joined: Apr 2004
Posts: 439
ON, Canada
yugrus Offline
yugrus  Offline
Joined: Apr 2004
Posts: 439
ON, Canada
I guess I can contribute to the subject as well. GM has some charging system in trucks like mine that is more advanced then many. It constantly monitors battery's SOC, and adjusts alternator output accordingly. So with my daily battery charging regime, the alternator produces 14.7 for about 4 minutes, up to the point that computer realizes that the battery is fully charged. Then the voltage drops to 12.6v, and could stay there for 30 minutes of driving, maybe more. Then it goes up to between 13.7-14.7. Then, after a while it drops back to 12.6V.
That is when the ambient temp is above 5C or so. When it is cold though, the voltage would never drop below 13.7V, and goes as high as 15V, so the software doesn't care about SOC, maybe it is trying to keep the battery warm? In any case, GM charging system would totally give you credit for the fully charged battery under normal conditions, and it will get it back to full charge quite fast after the start-up.


'14 Chevrolet Tahoe
'15 Mazda CX-5
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