I assume no, but never thought about it too much. Any reason for felt washers on AGM batteries? I have the washers in a package.
felt washers for batteries
- Thread starter Donald
- Start date
Right. Although some both are black. Are they needed with a AGM?
Maybe they are really only needed with Exide batteries!!
If you're no stranger to "checkups" between oil changes, you shouldn't have a problem without these and just using vaseline/silicone/battery terminal spray instead.
If its for a family member who may not be as maintenance-saavy, it could be a good saving grace for them
JCI ones sure need them! Actually, if they wrapped the entire battery in oiled felt, it might be enough!
Highboy
$100 Site Donor 2025
For .99 cents at Walmart, I always keep a extra one in my toolbox. Can’t hurt to use them.
I have only used these on batteries that seemed to have a history of excess gassing and thus inducing more corrosion than normal. My son had a 2008 Pontiac G6 base version with the 4 cylinder Ecotec. From day one the battery made excessive corrosion on the negative terminal. I cleaned the attachment lugs on both ends and kept them well coated with dielectric grease but the corrosion would still come back.
The car drove very well and never used oil or had any of the seemingly common Ecotec issues, but the negative battery terminal did suffer greatly from the "white powder disease often".
The car drove very well and never used oil or had any of the seemingly common Ecotec issues, but the negative battery terminal did suffer greatly from the "white powder disease often".
I rarely see leaks from the JCI ones in recent years. I think the issue is more related to overtightening of the battery terminals, which damages the seal.
I never used them, do you do often see them with a lot of corrosion on the terminals so I doubt they're worthwhile. I use the old school method of starting with clean terminals and applying grease or vasoline over them after you tighten them down. It's a very effective corrosion barrier, many cars like Honda's back in the day would leave the factory like that. Now it's generally been replaced with that bright coloured battery terminal spray.
AGM batteries don't normally gas like flooded batteries do. No need for the washers
Cheap batteries, you need them. Not so much on newer quality batteries.
JHZR2
Staff member
I was going to say. How does a terminal break on an AGM differ from a flooded battery? AGM can leak, can have build-up, etc. someone can break an AGM too.
But overall I ageee.. see much less of the leakage around the terminal these days.
When it was about 1.5 years old, I Put a Northstar AGM-27 in a battery tray below truck body, and then did not look at it for 2.5 years.
When i did look at it again, there was a small amount of green and white corrosion next to the terminals.
I have pics, but I cannot find them.
I cleaned off battery and clamps, and used some felt washers that I smeared with silglide, as it was handy.
3 years later or so, when the battery achieved around 1200 deep cycles, yet was just barely able to still start the engine, there was still no corrosion.
Yes flooded batteries benefit greatly from protection from the elements, as does ANY and EVERY electrical connection.
Those saying that AGMs do not need, or cannot benefit from greasing/ felting the terminals, should go strip the Dielectric grease from within every underhood connection on their vehicle.
I mean how, much do the washers and the grease to saturate them cost?
I took those red and green old felts from the worn out NS-27, and put them on my new Northstar group 31, and instead of Sylglide, I use NO-OX-ID grease.
https://www.sanchem.com/electrical-contact-lubricant.html
When i did look at it again, there was a small amount of green and white corrosion next to the terminals.
I have pics, but I cannot find them.
I cleaned off battery and clamps, and used some felt washers that I smeared with silglide, as it was handy.
3 years later or so, when the battery achieved around 1200 deep cycles, yet was just barely able to still start the engine, there was still no corrosion.
Yes flooded batteries benefit greatly from protection from the elements, as does ANY and EVERY electrical connection.
Those saying that AGMs do not need, or cannot benefit from greasing/ felting the terminals, should go strip the Dielectric grease from within every underhood connection on their vehicle.
I mean how, much do the washers and the grease to saturate them cost?
I took those red and green old felts from the worn out NS-27, and put them on my new Northstar group 31, and instead of Sylglide, I use NO-OX-ID grease.
https://www.sanchem.com/electrical-contact-lubricant.html
- Joined
- Jun 10, 2024
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While they are cheap, they are not 99 cents at my Walmart.
Mine has some for 97 cents for a pack of 2....
and they work fine for me....over the years...
Yes only needed for Exide leakers.
These work better than the green and red ones but you have to check Amazon when Walmart has them back in stock, they are 99c a pack not $10 like they are now. I got a 50 pack for $20, they have been doing a great job keeping the green crud away. Years ago a real copper penny did the trick.
https://www.walmart.com/ip/NOCO-NCP...ery-Terminal-Protectors-Pack-of-2/15343208024
https://www.walmart.com/ip/NOCO-NCP...ery-Terminal-Protectors-Pack-of-2/15343208024
My 09 Altima gets corrosion, always has no matter the battery. It literally builds on the metal bracket that holds the battery down. The alternator charges properly and it’s done it with ever battery I’ve installed and the washers never helped. I got used to cleaning it off and in 200k has never caused any problems.