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Open Roads Forum  >  Tech Issues

 > Battery wing nut size

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ndrorder

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Posted: 04/20/21 10:39am Link  |  Quote  |  Print  |  Notify Moderator

My Centennial batteries are 8 mm. FYI


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ndrorder

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Posted: 04/20/21 10:42am Link  |  Quote  |  Print  |  Notify Moderator

wing_zealot wrote:

swimmer_spe wrote:

BurbMan wrote:

Yes, most common size is 5/16-18 threads here in the US. Not sure if Canadian batteries would have metric studs?


I know it's not metric as one has studs that fit a 1/2 inch wrench.
Right there is your answer, if its 1/2 inch nut/wrench it's a 5/16 inch bolt.


My batts are threaded 8 mm. Standard wrench size for 8 mm is 13 mm which is almost indistinguishable from a 1/2" wrench.

red31

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Posted: 04/20/21 10:44am Link  |  Quote  |  Print  |  Notify Moderator

energizer specs https://www.eastpennmanufacturing.com/wp-content/uploads/Marine-Master-Spec-Sheet-0194.pdf

toedtoes

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Posted: 04/20/21 02:01pm Link  |  Quote  |  Print  |  Notify Moderator

clicky

IF the OP knew the actual battery model, this would provide the answer needed.


1975 American Clipper RV with Dodge 360 (photo in profile)
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swimmer_spe

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Posted: 04/20/21 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

wing_zealot wrote:

swimmer_spe wrote:

BurbMan wrote:

Yes, most common size is 5/16-18 threads here in the US. Not sure if Canadian batteries would have metric studs?


I know it's not metric as one has studs that fit a 1/2 inch wrench.
Right there is your answer, if its 1/2 inch nut/wrench it's a 5/16 inch bolt.


Thank you.

swimmer_spe

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Posted: 04/20/21 02:47pm Link  |  Quote  |  Print  |  Notify Moderator

red31 wrote:

energizer specs https://www.eastpennmanufacturing.com/wp-content/uploads/Marine-Master-Spec-Sheet-0194.pdf


Thank you

Fisherman

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Posted: 04/20/21 06:40pm Link  |  Quote  |  Print  |  Notify Moderator

On some batteries the positive are 3/8' and the negative are 5/16", others, both are 5/16. I keep a couple of each in the trailer spare parts bin.

mobeewan

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Posted: 04/20/21 08:34pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

mobeewan wrote:

Some are 3/8 inch & some are 7/16. Carry both.


You mean 5/16.


Yes 5/16 not 7/16.

swimmer_spe

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Posted: 04/20/21 08:38pm Link  |  Quote  |  Print  |  Notify Moderator

OP here

So, I was going to need wing nuts for one of the batteries. Turns out it is stone dead. So, I will see if a local auto service shop can charge it as mine can't. If not,t he need for wing nuts is the least of my worries.

Fisherman

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Posted: 04/21/21 09:32am Link  |  Quote  |  Print  |  Notify Moderator

swimmer_spe wrote:

OP here

So, I was going to need wing nuts for one of the batteries. Turns out it is stone dead. So, I will see if a local auto service shop can charge it as mine can't. If not,t he need for wing nuts is the least of my worries.


If the battery is too far gone, hook it up in parallel with a good one and then hook up the charger. Some chargers need to "see" some voltage before they will begin charging.

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