Group 31 Battery
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
Group 31 Battery
the past summer I have been running one of the 9 year old group 65 batteries that came with my truck. With the cold weather though, It is time for a new battery. When it gets under 15* and I have to run the glow plugs, It cranks over a little slower than I like. It always starts easy, but it is time to change before I get stranded.
I see a lot of people saying to get group 31 batteries, but I see other people saying that they don't fit. Since I only have one battery, I would like to get the best I can.
Will the group 31 fit?
I see a lot of people saying to get group 31 batteries, but I see other people saying that they don't fit. Since I only have one battery, I would like to get the best I can.
Will the group 31 fit?
Logistics Pro
Joined: Sep 2007
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From: Western Mass
Why are you only running one battery? If you get 2 batteries it will help the cold starting, and you don't need to worry about the larger size fitting or not.
I don't know if 31's fit or not, I believe the group 65 is the stock size and 2 work better than one.
I don't know if 31's fit or not, I believe the group 65 is the stock size and 2 work better than one.
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
What truck? If it's a stock IDI truck, no 31s won't fit. They are huge and also require a bolt on post. They do fit in the bed just fine though, but if you're going to that kind of trouble just get an 8-D and be done with it.
Postmaster
Joined: Dec 2011
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I've got group 31's in mine; they /barely/ fit. You may need to modify the battery floor/plate a bit, but it'll fit(though the negative outer side will definitely push at the hood padding).
*Good* group 65's work just fine, though. I've really not noticed any difference in cranking speed or anything, and the CCAs aren't that much less(like 850 instead of 950 or so).
*Good* group 65's work just fine, though. I've really not noticed any difference in cranking speed or anything, and the CCAs aren't that much less(like 850 instead of 950 or so).
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Logistics Pro
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From: Townsend, MT
I have an air filter in the way of the passenger side battery. They make group 31's that have post terminals but I prefer the stud anyways.
By modifying do you mean bending/removing the inner lip?
I guess I will pick up a battery tomorrow and give it a whirl. I'll probably throw a piece of rubber over the top just to be safe.
850 cca to 1000 cca is a pretty big difference and I would wager the 200 min reserve on the group 31 is a fair bit more than the group 65.
By modifying do you mean bending/removing the inner lip?
I guess I will pick up a battery tomorrow and give it a whirl. I'll probably throw a piece of rubber over the top just to be safe.
850 cca to 1000 cca is a pretty big difference and I would wager the 200 min reserve on the group 31 is a fair bit more than the group 65.
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
The group 31 fits great. I pulled the tray out and worked the lip on the anvil.
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Logistics Pro
Joined: Feb 2011
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From: Townsend, MT
I am glad to report that one group 31 battery will start my truck with ease at -15*F without being plugged in.
While browsing, I just came across these:
MX3000 | XS Power | Real Power, Unreal Performance
You could run to town and back on two of those.
While browsing, I just came across these:
MX3000 | XS Power | Real Power, Unreal Performance
You could run to town and back on two of those.
Lead Driver
Joined: Apr 2008
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Holy cow... that is spendy.
I think my starter is getting tired. -7 and no go. Was pretty rough at 11 the other morning but did go. I dont mind plugging it in when its that cold though. We dont even see single digits that often let alone negative.
I think my starter is getting tired. -7 and no go. Was pretty rough at 11 the other morning but did go. I dont mind plugging it in when its that cold though. We dont even see single digits that often let alone negative.
Postmaster
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I've been having my own troubles; it's been bitterly cold(11F and around) here as well, and sometimes my truck just cranks slowly. Sometimes it'll randomly crank faster, too, which is odd. But, it *is* 11F, and it *will* start, so I'm not yet worried. I do have a spare starter if I really need it, though...
Logistics Pro
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WTH, negative seven in Oregon???!!!
Lead Driver
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Last January was the 3rd coldest on record, only because it warmed up to the 20s in the last week. The average temperature was 4*. In 1986 the average was 2* and -1 in 1898
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