6 volt battery slight tiny bulge

[Grumpy Grampa]

I have a 2017 Thor Miramar 37.1 with 4-each 6 volt batteries now 8 months old. I never noticed this before, but one of the batteries has a very tiny bulge on the side. Is this something to worry about?

Thanks

[ducksface]

If it's palm sized, no worry.
If it's a knot, replace under warranty.

[Chateau_Nomad]

If not sealed batteries, test the electrolyte with a battery hydrometer. That will give a true indication of the battery health.

[Beau388]

Originally Posted by Grumpy Grampa

I have a 2017 Thor Miramar 37.1 with 4-each 6 volt batteries now 8 months old. I never noticed this before, but one of the batteries has a very tiny bulge on the side. Is this something to worry about?

Thanks

All lead-acid batteries swell when they are discharged. If the flooded battery is more than 2 years old, some slight swelling in normal even in a fully charged battery. This shows the battery has lost a little of its amp-h capacity.