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Charging Battery - -Amps? #4665803
02/14/18 12:51 PM
02/14/18 12:51 PM
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
cb450sc Offline OP
cb450sc  Offline OP
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
I have a 2005 Civic and the battery has been struggling the past couple of weeks in the cold weather. I have only taken short trips with the car the past month. I have a smart charger which allows me to charge at 2, 4 or 6 amps. I am not in a rush. Is it any better to charge a battery at 2 or 6 amps in terms of battery reliability? What would you charge it at?

Re: Charging Battery - -Amps? [Re: cb450sc] #4665807
02/14/18 12:54 PM
02/14/18 12:54 PM
Joined: Oct 2002
Posts: 36,623
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,623
Great Lakes
I would set it to 6 amps. Smart charger will automatically reduce current as the battery nears full charge.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Charging Battery - -Amps? [Re: cb450sc] #4665812
02/14/18 01:02 PM
02/14/18 01:02 PM
Joined: Dec 2017
Posts: 3,007
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,007
SE British Columbia, Canada
I am absolutely not an expert on this but my smart charger will try settle in at 2 amps and then less as it charges, but if the battery was quite depleted it might start out at 6 amps. Take a look at what it is doing at the 6 amp setting and what it does at the two amp setting. If it starts at 6 and stays there, try 2 amps (if you have more time). The lower setting is probably better if you have the time.


If you want the job done right......do it yourself.
Re: Charging Battery - -Amps? [Re: cb450sc] #4665821
02/14/18 01:12 PM
02/14/18 01:12 PM
Joined: Apr 2012
Posts: 5,589
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,589
MA
Anything under 10 amps should be fine. So 6 amps should be fine.

Re: Charging Battery - -Amps? [Re: Snagglefoot] #4665826
02/14/18 01:18 PM
02/14/18 01:18 PM
Joined: Jan 2016
Posts: 715
Nebraska
Duffyjr Offline
Duffyjr  Offline
Joined: Jan 2016
Posts: 715
Nebraska
My Ctek charges at 4.3 but I have no control over that. What charger do you have, I thought smart chargers adjusted all that for you.


89 GMC Sierra VWB 5w30/TG3980
08 Lucerne CX Magnatec 5w30/TG3387A
02 DeVille VWB 5w30/CQ Blue
18 Toro Super Recycler T5 10w30
Re: Charging Battery - -Amps? [Re: cb450sc] #4665831
02/14/18 01:22 PM
02/14/18 01:22 PM
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
cb450sc Offline OP
cb450sc  Offline OP
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
The charger is a Motomaster Eliminator Intelligent charger.

Re: Charging Battery - -Amps? [Re: Duffyjr] #4665838
02/14/18 01:27 PM
02/14/18 01:27 PM
Joined: Oct 2002
Posts: 36,623
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,623
Great Lakes
Originally Posted By: Duffyjr
I thought smart chargers adjusted all that for you.

They do, but some of them also allow you to limit max current that can be pushed. For a small motorcycle/OPE battery you may want to limit current to 2A. For larger car batteries, 10A or more may be appropriate.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Charging Battery - -Amps? [Re: cb450sc] #4665852
02/14/18 01:36 PM
02/14/18 01:36 PM
Joined: Jul 2003
Posts: 2,422
MN
tmorris1 Offline
tmorris1  Offline
Joined: Jul 2003
Posts: 2,422
MN
Lower amps will be a more complete charge but will take longer. Also easier on the battery.

Re: Charging Battery - -Amps? [Re: tmorris1] #4665875
02/14/18 01:55 PM
02/14/18 01:55 PM
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 13,141
NE,Ohio
Originally Posted By: tmorris1
Lower amps will be a more complete charge but will take longer. Also easier on the battery.


For a normal car battery 6 amps is pretty low IMO.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Charging Battery - -Amps? [Re: cb450sc] #4665880
02/14/18 01:59 PM
02/14/18 01:59 PM
Joined: Dec 2009
Posts: 670
Wash, DC
circuitsmith Offline
circuitsmith  Offline
Joined: Dec 2009
Posts: 670
Wash, DC
The initial current is not as important as charging long enough to fully charge the battery.
The charger maintains about 14V, then the charge current the battery accepts will fall
as the battery fills up.
A healthy battery of the size in a Civic (~50AH)will accept less than 2 amps when nearly full.
Example, recently charged the battery in my Matrix:
First, I do it every 3-6 months due to infrequent use (6K miles/yr) and short trips.
Battery rest voltage 12.5V. Temp ~60F
Using an adjustable supply (I like to be in control) set to 14V, initial charge current 2A (limit of supply).
Falls to 0.75A at 5 minutes, 0.65A at 2 hours, still 0.65A at 4 hours, 0.23A at 12 hours (overnight).
So you see the current reached a plateau that lasted for several hours.
It takes time to drive out sulfation on the plates.
My last battery was still going strong after 9 years of this routine when I swapped it.
Just didn't want to try for a 10th winter.

Last edited by circuitsmith; 02/14/18 02:03 PM.

2017 Hyundai Tucson SE FWD, 5000mi/12mo OCI
Re: Charging Battery - -Amps? [Re: cb450sc] #4665888
02/14/18 02:08 PM
02/14/18 02:08 PM
Joined: May 2012
Posts: 4,533
Baltimore, Maryland, USA
zzyzzx Offline
zzyzzx  Offline
Joined: May 2012
Posts: 4,533
Baltimore, Maryland, USA
Is getting a new car battery an option???

Re: Charging Battery - -Amps? [Re: cb450sc] #4665903
02/14/18 02:26 PM
02/14/18 02:26 PM
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
cb450sc Offline OP
cb450sc  Offline OP
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
If it won't charge up then yes I will be looking for a new battery. I am just trying to get whatever I can out of it.

Re: Charging Battery - -Amps? [Re: Rand] #4665918
02/14/18 02:41 PM
02/14/18 02:41 PM
Joined: Oct 2002
Posts: 36,623
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,623
Great Lakes
Originally Posted By: Rand
Originally Posted By: tmorris1
Lower amps will be a more complete charge but will take longer. Also easier on the battery.


For a normal car battery 6 amps is pretty low IMO.


Yup. For a 60 AH battery, 6A current is barely 0.1C. That should be well within what the battery can handle.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: Charging Battery - -Amps? [Re: cb450sc] #4666073
02/14/18 05:22 PM
02/14/18 05:22 PM
Joined: Mar 2015
Posts: 5,421
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,421
Virginia
How old is this battery?? Has it been maintenance charged regularly before this?? What type of battery is this?? AGM, flooded ?? If this battery is 6 years or older then you really should just buy a new one if possible.

Last edited by bbhero; 02/14/18 05:23 PM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: Charging Battery - -Amps? [Re: cb450sc] #4666096
02/14/18 06:01 PM
02/14/18 06:01 PM
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
cb450sc Offline OP
cb450sc  Offline OP
Joined: Jan 2006
Posts: 526
Chatham, Ontario, Canada
The battery is four years old, flooded, it has been maintained by checking water level and charging at least a couple times a year.

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