Diehard Platinum Group 31M Battery in OEM Main Location
Description:
Item # 02850131000P Model # 50131
The DieHard Marine Battery Size 31m has tin-coated brass terminals and 99.99 percent pure virgin lead plates, that make it durable, powerful and reliable. Safety first design features a non-spillable and sealed design with an Absorbed Glass Mat construction. These glass mats are instrumental in keeping the acid in place to make the battery vibration-resistant and easy to mount. Sail away on a sunny day or as the rain lashes at the shores with this weather-resistant battery.
Maintenance-free this Group Size 31m battery is ideal for use on your recreational marine vehicle
Features 1150 CCA that delivers quick ignition
Container is made from high-quality polycarbonate/polyester
Has a long off-season storage power and a reserve power of 205 minutes
An AGM construction offers the battery longevity and mounting flexibility
The battery is vibration-resistant and sports a military-grade construction
Item Weight: 75 lbs.
Dimensions: 13"(L) x 6.8"(W) x 9.5"(H)
Three-year free replacement limited manufacturer's warranty
Specifications:
Dimensions:
Height (in.): 9.5
Item Weight (lbs.): 75
Length (in.): 13
Width (in.): 6.8
Battery Type:
Group Size: 31M
Power Configuration:
Number of Cells: 6
Power Ratings:
Amp Hours at 20 Hour Rate: 100
Capacity Amp Hours at 10 Hour Rating: 92
Cold Cranking Amps (CCA at 0 deg.F): 1150
Reserve Capacity (RC): 205 min.
Design & Construction:
Battery Design:Absorbed Glass Mat
Container Material: Polycarbonate/polyester
Maintenance: Maintenance Free
Overall Type: Deep-cycle
Temperate Zone: North or South
Positive Terminal Side: Right
Terminal Post Location: Top
Warranties & Coverage:
Free Replacement Warranty Term: 36 months
NOTES
It is important to note that the Diehard Group 31M has 2 DIFFERENT SIZE terminal posts.
POSITIVE: 3/8-16 : This will fit a normal Fleet Terminal.
NEGATIVE: 5/16-18 : This will need a shim to fit a Fleet Terminal
Parts:
Diehard Platinum Group 31M, $231, Sears
Fleet Terminal (AC166), ~$12, Advance Auto Parts
Fleet Terminal (AC166), ~$2.5, Advance Auto Parts
Installation:
The Group 31M fits in the OEM Main Battery location with only a few modifications to the terminal ends. The L-shaped cable ends need to be flattened out in order for them to clear the battery. Because the fleet terminals stick out a little more I felt that made things a tad easier as well.
I used my hydraulic crimper to flatten out the cable ends. This was relatively easy to manage by one person and created flatter ends than I would have been able to achieve by using pliers.
You also will need to flatten out one of the little wings on the positive cable so it can be connected to the fleet terminal.
With the cable ends adjusted, you can now place the battery. The OEM plastic battery tray won't fit the battery, so you'll either have to upgrade to an aftermarket universal tray or battery cage. You can install it without, but you have a higher risk of the battery twisting under the battery tie-down.
The positive wires hooked up to the fleet terminal.
The negative (ground) wires hooked up to the fleet terminal (using a post shim):
I used a large screwdriver to emboss the minus sign into the shim.
Once fully tied down, your end result should look something like this:
Make sure you check your suspension measurement, because the Group 31M is significantly heavier than the OEM battery. I had to crank my adjustable coil quite a bit for it to match the passenger side lift once again.
Also, take a picture of your radio settings (stations etc) before you disconnect the old battery, because you will have to reset everything. Having a picture of the various screens will allow you to set your stations quickly and efficiently.
Lastly, write on your battery with a sharpie when you installed it. Makes it easy for both replacement and possible warranty information.
EDIT:
You can buy terminal studs for the threaded posts here:
Stud to Post Conversion Adapters - Remy Battery
Make sure you get one each of the following sizes: 5/16-18 and 3/8-16.
Okki