| | |  | Weather Instruments | Home » » » » Optima Batteries OPT D31M Group 31 Marine Battery, BlueTop | | | | | | | Description: | | Optima D31M BlueTop is designed as a dual purpose battery, both starting and deep cycle for people who need a sure-starting, strong cranking, and maintenance free power source for their boat or RV, even in harsh conditions. The unique SpiralCell design provides a strong and clean power source, ensuring the safety of you, your family and the environment. The higher reserve capacity gives you a longer shelf-life to give you the power when you need it, where you need it. This battery is designed to be used with recreational vehicles or boats with large accessory loads. | | | Features: | |
• 12-Volt, 900 Cold Cranking Amps, Size: 12 13/16" x 6 1/2" x 9 3/8" tall, Weight: 59.8 pounds, Dual SAE & 5/16" Stainless Steel Stud Posts
• Reserve capacity of 155 minutes for constant performance
• Optimal starting power even in bad weather
• Fifteen times more resistant to vibration for durability
• Leak-proof for safer use and longer life
| | | Product Details: | | | Product Length:
| 12.8 inches | | Product Width:
| 6.5 inches | | Product Height:
| 9.38 inches | | Product Weight:
| 59.8 pounds | | Package Length:
| 12.8 inches | | Package Width:
| 9.38 inches | | Package Height:
| 6.5 inches | | Package Weight:
| 59.8 pounds | | Average Customer Rating:
|  based on 10 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
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 Love them!Nov 17, 2009
I've bought nothing but Optima batteries for my boats since 2002 and love them. No servicing required and they've lasted more than five years, on average, vs. one or two years for conventional batteries.
Great batterySep 10, 2009
I really wonder if some reviewers here actually read Optima's FAQ.
Optima clearly states that a deeply discharged battery may appear (even to "techs") as defective and explains how to charge such battery.
Also, ANY lead acid battery is subject to sulfation if stored at low charge. Desulfating chargers work and don't cost that much.
 Most Overated Battrey on the PlanetAug 29, 2009
Over the past 5 years I have purchased 3 Optima batteries. The first one lasted just past it's warranty date and then failed. It was a red top. The last two were very expensive blue top marine deep cycle/starting batteries purchased at the same time and put in the same boat. The batteries operated through a Perko switch set on ALL. They charged together and discharged together. They are just now 37 months old. One has failed completly and the other still works. The warranty is 18 month free replacement and 18 month prorated. So here again no warranty help.
Most battries that you purchase for $200+ have a 48 or 60 month warranty. Optima does not. The company would go out of business if it had to honor warranties that other battery manufactures offer. Optima is just a lot of hype. I have learned my lesson and will never purchase another Optima battery.
Optima is owned by Johnson Controls and moved their manufacturing plant to Mexico. In Mexico they are not held to strict enviornmental laws and employ cheap labor. They now offer only a 24 month warranty, period. I guess they know how long their battery is good for.
 Great Battery, Beware of Amazon ShippingJul 22, 2009
Beware of Amazon shipping. Battery shipped from CA to NY and battery case was damaged; leaking fluid. Called Amazon, explained that packing was poor (Single walled cardboard box, no packing material. Item weights 60 #). Amazon sent another battery SAME packing method. Same thing happened, case was cracked and leaking fluid. Amazon needs to do some work to communicate customer feedback regarding packing. Packing method was not what I would have expected from Amazon and then they do the same thing again! Two batteries cracked and worthless because care was not taken to correctly pack the batteries. Sad considering these batteries cost over $200 each.
 Mixed bag at best...Jun 13, 2009
I've purchased about 6 total Optima batteries over the last ten or so years for various vehicles. I have had to replace THREE (not concurrently) at right about 1 year of use *under warranty* due to the battery not holding a charge.
Actually, last night, my 2005 car wouldn't start. Dead battery. I parked the car for about 2 hours, no lights on, etc. to come back to a dead battery. The thing is - I replaced this battery a year ago for the same issue. Alternator checked out, etc. on the car, and putting the OE battery back in (yes, I've kept it) worked like a champ.
I took mine back to my local Optima dealer (where I purchased it), and they tested it as "internally faulted" (the same as the old one), so it is not due to a broken charging system, etc.
The other units I've taken back (both red and yellow tops) failed around 1 year as well, in different vehicles... Granted - the replacements for them seemed to last until I sold the vehicles...
Again, I've never abused the Optimas - and don't have any mods to my vehicles... This CAN'T be coincidence, especially since the OE batteries in the aforementioned vehicles were in perfect shape when replaced - and all lasted over a year, and are still running great in one of the vehicles...
I'm personally going to look into the Exide Orbital in the future... Maybe they have perfected the technology.
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