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#4665803 - 02/14/18 12:51 PM Charging Battery - -Amps?
cb450sc Offline


Registered: 01/06/06
Posts: 454
Loc: 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?

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#4665807 - 02/14/18 12:54 PM Re: Charging Battery - -Amps? [Re: cb450sc]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35204
Loc: Great Lakes
I would set it to 6 amps. Smart charger will automatically reduce current as the battery nears full charge.
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#4665812 - 02/14/18 01:02 PM Re: Charging Battery - -Amps? [Re: cb450sc]
Snagglefoot Offline


Registered: 12/31/17
Posts: 537
Loc: Alberta
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.

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#4665821 - 02/14/18 01:12 PM Re: Charging Battery - -Amps? [Re: cb450sc]
Wolf359 Offline


Registered: 04/27/12
Posts: 4124
Loc: MA
Anything under 10 amps should be fine. So 6 amps should be fine.

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#4665826 - 02/14/18 01:18 PM Re: Charging Battery - -Amps? [Re: Snagglefoot]
Duffyjr Offline


Registered: 01/13/16
Posts: 447
Loc: 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.
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#4665831 - 02/14/18 01:22 PM Re: Charging Battery - -Amps? [Re: cb450sc]
cb450sc Offline


Registered: 01/06/06
Posts: 454
Loc: Chatham, Ontario, Canada
The charger is a Motomaster Eliminator Intelligent charger.

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#4665838 - 02/14/18 01:27 PM Re: Charging Battery - -Amps? [Re: Duffyjr]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35204
Loc: 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.
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#4665852 - 02/14/18 01:36 PM Re: Charging Battery - -Amps? [Re: cb450sc]
tmorris1 Online   content


Registered: 07/15/03
Posts: 2260
Loc: MN
Lower amps will be a more complete charge but will take longer. Also easier on the battery.

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#4665875 - 02/14/18 01:55 PM Re: Charging Battery - -Amps? [Re: tmorris1]
Rand Offline


Registered: 08/20/03
Posts: 12349
Loc: 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.
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#4665880 - 02/14/18 01:59 PM Re: Charging Battery - -Amps? [Re: cb450sc]
circuitsmith Online   content


Registered: 12/17/09
Posts: 599
Loc: 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.


Edited by circuitsmith (02/14/18 02:03 PM)
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#4665888 - 02/14/18 02:08 PM Re: Charging Battery - -Amps? [Re: cb450sc]
zzyzzx Offline


Registered: 05/18/12
Posts: 4194
Loc: Baltimore, Maryland, USA
Is getting a new car battery an option???

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#4665903 - 02/14/18 02:26 PM Re: Charging Battery - -Amps? [Re: cb450sc]
cb450sc Offline


Registered: 01/06/06
Posts: 454
Loc: 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.

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#4665918 - 02/14/18 02:41 PM Re: Charging Battery - -Amps? [Re: Rand]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35204
Loc: 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.
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'02 530i (Edge HM 10W-40)
'15 Q5 3.0T (Edge 5W-40)

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#4666073 - 02/14/18 05:22 PM Re: Charging Battery - -Amps? [Re: cb450sc]
bbhero Offline


Registered: 03/20/15
Posts: 4047
Loc: 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.


Edited by bbhero (02/14/18 05:23 PM)
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#4666096 - 02/14/18 06:01 PM Re: Charging Battery - -Amps? [Re: cb450sc]
cb450sc Offline


Registered: 01/06/06
Posts: 454
Loc: 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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