OPTIMA Batteries High Performance D31M BlueTop Dual Purpose Deep Cycle and Starting Sealed AGM Boat and RV Battery, 900 CCA, Dual Terminal, Maintenance Free, Versitile Mounting

I purchased two of these batteries for my boat - one in early 2009 and the other in late 2010. I alternate using these batteries for starting the boat. I also use them for my down riggers when salmon fishing and trolling with a 9.9 HP kicker motor. After over 14 years, both batteries still start the boat with no issue. Plus, I can fish for at least four hours on one battery & still start the boat on that battery. Before I started using these two Optima batteries, a pair group 27 name brand non-AGM batteries only lasted 3 years.

I originally purchased these batteries 5 years ago for my old 5th wheel. I stored the rv at a campground in Arizona for 6 months and forgot and left the ceiling fan on. Of course the batteries eventually ran out of juice and were in a constant discharge for the whole time. When I returned, I put the rv on shore power and charged the batteries. I kept them in use for 2 more years for dry camping and solar charging, then transferred them to my new truck camper, where to this day, they are storing power from my solar panels and are still working as they should. They have been in service for a total of 5+ years so far. I have never been able to get regular plate batteries to last more than 3 years, definitely worth the difference in price if you need reliable power storage.

Have 3 optima batteries great battery. I have one on my cranking system (everything except the trolling motor) ran 2 HDS 10's (one with Structure Scan) and a AM/FM radio, live well w/timer, nav lights, for 8 hours and still had enough battery to start my boat (Mercury 90 HPS). The batteries didn't work so well when I installed a ProMariner Pro Tournament 300. Went back to Pro Charging Systems (Quad Pro - Four 15 AMP Banks). With this combination I never have to worry about the batteriers not getting charged. Fish trolling motor lakes and the Minnkota 101 36 volt can go 10 hours and still has plenty to get me back to the ramp. I would recommend this to some one and I will buy another one in the next year or so, waiting for the last battery (Ever Start) to kick the bucket.

Purchased 09/16/2022, NEW, to replace an old Dual Marine NON-AGM Battery that was 6yrs old. Did hours of reading and research and reviews before we made the decision to purchase this Blue Top AGM Battery from Optima. We weren't able to get the boat in the water in 2023 due to my FNL having medical issues, so we kept it on a battery tender and then April of 2024 we put in the boat, 2012 Hurricane SunSport 202 w/Evinrude E-Tec 200HP OB and it ran great all spring and Summer. We pull the boat out approximately 4 weeks ago and noticed battery was week and it says it has a dead cell and won't charge completely. Will not purchase another battery from Optima and will go back to a traditional marine battery with much greater life expectancy. Spending more money for what would seem to be the "best" AGM battery for our application turned out to not be the case. Thanks, Optima, for a subpar performing product.SincerelyUGWU$4

Optima batteries are one of the best on the market. I am very impressed by their longevity and high power delivery. I have had a yellow top Optima in my 4wd truck for 9 years now and it is as strong as the day I installed it. Other great features of Optima batteries are the facts that you never have to add water, they can be mounted in most any position and the terminals never corrode.This purchase was a second blue top D31M. I use two of these batteries in parallel to power a 2000 watt inverter. I tested it by placing a 1500 watt load on the inverter which drew 137.5 amps from the two batteries in parallel. They were able to sustain this load for 27 minutes. That is like cranking a 6 cylinder engine for half an hour. I previously used marine deep-cycle flooded-cell batteries for my inverter but they would only last about two years and I constantly had to check and add water as well as clean corrosion from the terminals. The bottom line is even though you pay more initially to buy an Optima battery the long life and power delivery quality actually make it cheaper than other batteries when you divide the cost by the number of years of service.

The battery was @75% when it arrived. It did charge to 100% and I’ve cycled it a couple of times now so it’s working as advertised. I have every reason to believe it’s going to be good. If I did it again though, I would buy locally. Why? Box was damaged, battery was missing a post cap and there was no other packaging. The battery appears new but packaging indicated it had been opened. Also, how would I get warranty?

I purchased three of these very expensive batteries for use as my Chassis Battery Bank in my 40 foot Alfa SeeYa RV. They fit, provide the power and appear to be very well made. If they prove to be as good as they are touted, I will be looking into more of these for my two other onboard battery systems, House and Inverter banks. We will see how the first three perform. I will continue to report back over time and let you know how it goes. Optima also has a great customer service and was very helpful in my planning process and purchase. In addition, I also purchased the Optima D1200 Battery Charger and Performance Maintainer for keeping the batteries properly charged and maintained while in storage, a key to extending the life of any battery system.