AGM battery charging basics ?
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Race Director
Joined: Aug 1999
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From: SE Pennsylvania
St. Jude Donor '03 thru '26
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AGM battery charging basics ?
Two weeks agon I went out and found my Optima Red Top battery of 2 years old had died. So I thought that Ok, it was just the luck of the draw that it went bad. I purchaed a brand new Optima 75/25 Battery and, I do keep my 2003 on a trickle charger if I'm not using my car for 2 weekks or more. I checked the charge once installed, @ 12.73 volts and I took the charger off (It is NOCO Genius-1 charger set on AMG and it has a small red/orange/green light to indicate the charge leval. I left it on overnight and the next moring I measured again and it had 12.75 volts, I saw something about the AMG batteries that suggested the new AGM battery needs to discharge once or twice down to 11.8 Volts to condition the battery to acept a higher voltage Truth or Not ?
Melting Slicks
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Optima has the specifications for charging Optima batteries. https://www.optimabatteries.com/support
Read the answer to "Charging Optima AGM batteries".
I expect your Noco Genius meets those but consult your owner's manual to be sure and contact Noco if you have questions about it.
I've never heard of discharging to a certain state of charge to condition a modern auto battery to accept a full charge.
Read the answer to "Charging Optima AGM batteries".
I expect your Noco Genius meets those but consult your owner's manual to be sure and contact Noco if you have questions about it.
I've never heard of discharging to a certain state of charge to condition a modern auto battery to accept a full charge.
Thread Starter
Race Director
Joined: Aug 1999
Posts: 11,117
Likes: 671
From: SE Pennsylvania
St. Jude Donor '03 thru '26
Oldtimer
Perhaps I'm a little confused. I just thougfht that it's resistens to taking a greater charge out of the box. I had a Red Top 75/25 in my last C5 and it was fine for 4 years, which is about the most I've ever seen any battery lasted !
Thank you,
Thank you,
