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batttery re charge time after one start #4480026
08/05/17 02:26 PM
08/05/17 02:26 PM
Joined: Jan 2003
Posts: 3,151
Coastal South Carolina
edwardh1 Offline OP
edwardh1  Offline OP
Joined: Jan 2003
Posts: 3,151
Coastal South Carolina
if your car sits say a week, and you then you start it, how long does it take at idle to replace the current used to start it,


These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: batttery re charge time after one start [Re: edwardh1] #4480031
08/05/17 02:33 PM
08/05/17 02:33 PM
Joined: Aug 2009
Posts: 3,921
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,921
Pittsburgh,PA U.S.A.
The charge lost from sitting a week is probably much more than the loss from one start.


Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: batttery re charge time after one start [Re: edwardh1] #4480043
08/05/17 02:48 PM
08/05/17 02:48 PM
Joined: Oct 2010
Posts: 1,793
california
wrcsixeight Offline
wrcsixeight  Offline
Joined: Oct 2010
Posts: 1,793
california
Impossible to say without knowing the parasitic load on the battery during that week.

Getting a Lead acid battery from 80% charged to 100% charged takes about 3.5 hours on a healthy battery at higher absorption voltages, 14.4 to 14.8ish volts.

The more charged a battery is, the slower it charges.

I have an AGM battery which when absolutley stuffed full, accepts 0.0x amps at 14.7 volts. The X is because i have no ammeter which can read currents to this small level

If I start my vehicle with this 100% stuffed full battery, when the amps required to maintain 14.7v taper back to 0.0x amps, the battery can again be considered fully charged.

This takes about 45 seconds. This proves not that the battery recharges quickly, but that very little of the battery capacity is requred to start a modern fuel injected vehicle.

a 0.05 amp parasitic load is 1.2AH of capacity each day taken from the battery

A car battery is generally 65 to 85 AH capacity.

Voltage is electrical pressure, HIgher pressures cause more amps to flow, but a 80%+ charged battery can only be recharged so quickly, and this rate is pretty slow.

Best to always have a lead acid battery at full charge. Anything less is detremental to some degree.


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Re: batttery re charge time after one start [Re: edwardh1] #4480044
08/05/17 02:52 PM
08/05/17 02:52 PM
Joined: Mar 2004
Posts: 21,121
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,121
Upstate NY
With EFI and an engine that has been tuned up the current drain for one start is minimal.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: batttery re charge time after one start [Re: edwardh1] #4480047
08/05/17 03:04 PM
08/05/17 03:04 PM
Joined: Jun 2003
Posts: 5,951
Illinois
SHOZ Offline
SHOZ  Offline
Joined: Jun 2003
Posts: 5,951
Illinois
It usually takes my car 5-10 miles to 90% recover from a start at highway speeds. Idle is not going to charge much. When I start it the voltage goes up to 14.5 and starts to taper. After a good 45 minutes it is down in the 13.7 range. Depends on the temperature too as hotter will be lower voltage.


2008 Hyundai Accent 1.6L 5 sp manual hatchback
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Re: batttery re charge time after one start [Re: edwardh1] #4480051
08/05/17 03:10 PM
08/05/17 03:10 PM
Joined: Mar 2004
Posts: 21,121
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 21,121
Upstate NY
With EFI and an engine that has been tuned up the current drain for one start is minimal.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: batttery re charge time after one start [Re: Donald] #4480064
08/05/17 03:22 PM
08/05/17 03:22 PM
Joined: Jul 2005
Posts: 11,378
NorthEast
Vikas Offline
Vikas  Offline
Joined: Jul 2005
Posts: 11,378
NorthEast
Originally Posted By: Donald
With EFI and an engine that has been tuned up the current drain for one start is minimal.

The cars I am familiar with turn the starter for fraction of second before the engine catches. The current drain for one start is indeed minimal.

Re: batttery re charge time after one start [Re: edwardh1] #4480118
08/05/17 05:10 PM
08/05/17 05:10 PM
Joined: Jun 2003
Posts: 33,568
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,568
ME
wrx has the "right answer" but I'll append that if your battery is only at 80% you'll get back where you started (pardon the pun) faster than if it was at or close to 100%. Discharged batteries with lower internal resistance take more amps at a given float voltage.

Temperature compensation keeps your battery from boiling dry; cars go up to 14.5 volts after starting to wake up their cold batteries with lethargic chemistry. They drop to 13.8 not because the battery is full but because it (or the alternator) is warm.

Dodges use a battery temp sensor while other cars infer temp from alternator temp or a body control module program. Some drop the voltage to 13, "neither charging nor discharging" to save fuel. I would bet nearly every car "puts it back" within the first minute, probably because of clumsiness sensing the rising heat level and temporarily "overcharging", which I put in quotes, as it's a matter of opinion (luck?) unless you have an ammeter on the battery cable seeing flow in or out.

The only other possible nail in the coffin is if your car has air-ride suspension, smog air pump motors etc that run after startup and would consume all of the surplus amperage.

Re: batttery re charge time after one start [Re: edwardh1] #4480119
08/05/17 05:11 PM
08/05/17 05:11 PM
Joined: Feb 2006
Posts: 156
SoCal
shokhead Offline
shokhead  Offline
Joined: Feb 2006
Posts: 156
SoCal
My dad told me once in the 70's that one start and you need todrive 15 minutes to put that back into the battery. No clue if that was/is true.


2014 Audi SQ5 ice silver metallic premium plus with black nappa leather and 21's
Re: batttery re charge time after one start [Re: shokhead] #4480226
08/05/17 07:46 PM
08/05/17 07:46 PM
Joined: Dec 2016
Posts: 7,171
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,171
Waco, TX
Originally Posted By: shokhead
My dad told me once in the 70's that one start and you need todrive 15 minutes to put that back into the battery. No clue if that was/is true.


It depends ENTIRELY on the voltage regulator set-point, and % of alternator output available.


"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: batttery re charge time after one start [Re: edwardh1] #4480495
08/06/17 06:43 AM
08/06/17 06:43 AM
Joined: Dec 2010
Posts: 983
Lexington, NC
tc1446 Offline
tc1446  Offline
Joined: Dec 2010
Posts: 983
Lexington, NC
If a vehicle is going to sit for more than a week, say two or three weeks, should a Batt Tender be hooked up?
I use a Tender on the tractor and riding mower in the fall and winter when it sits for long periods, but often my
truck will sit for two or three weeks and I've not been putting a Tender on it.

Last edited by tc1446; 08/06/17 06:45 AM.

'13 Accord EX-L 2.4L (110K) M1 & FU
'00 Ford Ranger 4.0L {69K} M1 & FU
'18 Polaris Slingshot 2.4L GM (QS & Bosch Cart.)
'07 Kioti CK-30 (Delo & Wix)
Re: batttery re charge time after one start [Re: edwardh1] #4480819
08/06/17 12:28 PM
08/06/17 12:28 PM
Joined: Jan 2016
Posts: 337
Cheshire, England
barryh Offline
barryh  Offline
Joined: Jan 2016
Posts: 337
Cheshire, England
The issue with battery charging on modern cars is not recovering from a start, it would do that in the first half mile. A bigger problem is when you wake the car up by opening the door there are any number of computers drawing current and that adds up to several amps. It's the same when parking up as the car takes several minutes to go to sleep. You can't open a door or the boot lid when the car is parked in your garage without triggering a draw of several amps and it doesn't stop directly the door is closed again. For these reasons it's not possible for a modern car to finish a journey and start the next journey with a 100% fully charged battery even before thinking about leaving it for a week. A battery tender is certainly in order.

O for the days when opening a door just turned on the interior light.



Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)
Re: batttery re charge time after one start [Re: edwardh1] #4480952
08/06/17 02:42 PM
08/06/17 02:42 PM
Joined: Jun 2003
Posts: 33,568
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,568
ME
A tender is a good idea but so are solar panels, especially if your cigarette lighter is always on.

Re: batttery re charge time after one start [Re: edwardh1] #4481122
08/06/17 05:47 PM
08/06/17 05:47 PM
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
Solar panels on a hybrid. I'm disappointed this hasn't become commercial


2010 Ford Fusion SE 3.0L V6, 181 miles M1 HM 10w-30
Re: batttery re charge time after one start [Re: edwardh1] #4481817
08/07/17 12:25 PM
08/07/17 12:25 PM
Joined: May 2006
Posts: 300
California
brave sir robin Offline
brave sir robin  Offline
Joined: May 2006
Posts: 300
California
I picked up one of these solar battery chargers on Amazon a month or so ago and it works great. It will easily keep a battery topped off and manages to charge my bikes battery a lot quicker than its 7.5w rating would suggest. The pathy has a moderate parasitic draw and after a week the battery would read 12.34v with the solar charger only getting a few hours of direct sunlight a day it is now in the 12.67-12.7v range


HIGHLY recommended



With dreams to be a king, first one should be a man
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