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charge 12v truck battery with more or less amps? #5443971 06/01/20 02:10 PM
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apollo18 Offline OP
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hey guys so i hooked up my noco genius g3500 and it shows my truck battery is only at 50% which is understanble since i mostly drive stop and go.
i believe this noco genius g3500 does automatic step charging and the max is 3.5a
i also have a motor master eliminator battery charger from canadina tire which can do 6a on a normal smart charge mode but also "12A charge mode for large capacity or deeply discharged batteries features an innovative 30A intermittent boost for up to 50% faster charging (compared to a standard 15A charge rate)"

so out of the 3 different charge rates, which is the best for the battery? i assume the slow charger or or is better to use the 12a charge mode on the motomaster which is for large capacity or deeply dischagred battery cuz maybe the higher amps will break down any sulfation that may be present?

thx

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5443974 06/01/20 02:13 PM
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Chris142 Online Content
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Less is better. The 3.5a is fine.


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Re: charge 12v truck battery with more or less amps? [Re: Chris142] #5443990 06/01/20 02:29 PM
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JHZR2 Offline
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Originally Posted by Chris142
Less is better. The 3.5a is fine.



+1.

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5443999 06/01/20 02:40 PM
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cdlamb Offline
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I am not sure the difference between charging but there is a setting for AGM batteries too. Charges to 14.5 Volt for regular, 14.8 for AGM.

I am unsure if it will damage a regular battery if it is set on an AGM setting or if it would make any difference.

The NOCO chargers seem to work good in repairing batteries too. I had one that I thought was weak, & hooked up charger, until it showed fully charged. Seemed I was able to get another year out of it in the boat. Wouldn't hold a charge this spring though.

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5444056 06/01/20 03:43 PM
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Donald Offline
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Also how long can you wait for it to be fully charged. Less amps is better unless you need the truck right away.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5444084 06/01/20 04:37 PM
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eljefino Offline
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Put it on 6 amps until the built-in ammeter dips below 3 then switch to the Noco.

This 30 amp surge thing sounds like a gimmick you don't need yet.

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5444085 06/01/20 04:38 PM
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Wolf359 Offline
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Yeah, the 3.5A will be fine. The standard recommendation is to use less than 10 amps so the 12 isn't bad but it's a little bit on the high side. I use an 8 amp charger. You can use the 6 amp mode too, that should also be fine.

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5444166 06/01/20 06:55 PM
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ripcord Offline
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Any of those chargers are completely safe to use assuming they work correctly. Most battery manufacturers recommend a maximum charge rate of C20 for flooded lead acid starting batteries, which is just a fancy way of saying no more than 20% in amps of the amp hour rating of the battery. So, a typical 50 AH battery can be charged at 15 amps without issue.

Re: charge 12v truck battery with more or less amps? [Re: ripcord] #5444226 06/01/20 08:42 PM
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Originally Posted by ripcord
Any of those chargers are completely safe to use assuming they work correctly. Most battery manufacturers recommend a maximum charge rate of C20 for flooded lead acid starting batteries, which is just a fancy way of saying no more than 20% in amps of the amp hour rating of the battery. So, a typical 50 AH battery can be charged at 15 amps without issue.




C20 is supposed to be the 20 hour rate...

So really 1/20th the Ah value...

Re: charge 12v truck battery with more or less amps? [Re: apollo18] #5444321 06/01/20 11:13 PM
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Load test the battery after charging and see if the battery can even hold the charge???


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: charge 12v truck battery with more or less amps? [Re: cdlamb] #5446561 06/05/20 02:21 AM
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bonjo Offline
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Originally Posted by cdlamb
I am not sure the difference between charging but there is a setting for AGM batteries too. Charges to 14.5 Volt for regular, 14.8 for AGM.

I am unsure if it will damage a regular battery if it is set on an AGM setting or if it would make any difference.

The NOCO chargers seem to work good in repairing batteries too. I had one that I thought was weak, & hooked up charger, until it showed fully charged. Seemed I was able to get another year out of it in the boat. Wouldn't hold a charge this spring though.



Do not use the AGM mode if your have flooded lead acid battery. AGM batteries charging voltage is slightly higher which I personally would not want across the terminals.

As others have commented, I also think lower current is better; the slower reverse chemical reation produces less heat and gasing but off course takes longer.

I think all smart chargers these days include desulfation program

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