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Your cart is empty.The OPTIMA D34M 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. Refer to the user guide for troubleshooting steps. Up to 3x longer life and maintenance-free. Spillproof, mountable in virtually any position. More than 15 times the vibration resistance of standard flooded batteries. Best choice for supporting high electrical demands.
Mark
2025-06-20 14:17:50
I am like a lot of people wanting to save a few bucks. Unfortunately when you buy economy batteries you often lose money in the long run. This was the case for me so this time I went with a recognized industry leader. Optima batteries are top of the line and the difference in power and run time increase with these batteries is amazing. One word of caution. These are AGM batteries and they must be charged with a charger programmed for AGM batteries. If you use the wrong charger it could damage or destroy the charger and/or the batteries. Fortunately the onboard charger in my bassboat is designed to charge all types of batteries and a simple change of a screw in sensor ensures I will have these batteries in service for a very long time. When these batteries were delivered one of them was upside down. You can mount AGM batteries at any angle because there is no possibility of losing acid from the battery. The acid is soaked into fiberglass pads inside the battery. They were fully charged when I received them and I fished 2 long days with them before charging for the first time. I would highly recommed these batteries for any marine application.For the fishermen who have not used AGM battrries a word of caution. AGM batteries provide full power until they are dead. Most batteries will provide less and less power as the charge is depleted. That is a positive thing. Just know that when your battery loses its charge you have no notice. I charge every time I go fishing so I dont see this as a problem..
Joe V
2025-06-18 13:17:34
I bought this battery a bit over 1 year ago (on May 2023). Even after completely charging the battery on an OPTIMA charger, the battery would barely crank over a 20 hp outboard motor. I should have tried to return the battery then, but it still worked (barely), and I needed it for the boat. In Nov 2023 the battery was placed on an OPTIMA charger over the off season. Once again, this spring, the battery is still weak. The battery is not much better than the OPTIMA battery I replaced which I used for 9 years! Very disappointed and I will not be purchasing OPTIMA batteries again.UPDATE:I called customer service and explained the problem, and they will honor the warranty. Following the phone conversation, I got an email that said:We will need a picture of your proof of purchase and a picture of the bar code on the side of the batteryPut your case # in the subject line and email to amazonwarranty@optimabatteries.comI have yet to send in the info, but it seems like I will be able to get a replacement (I'll update here if I do not)So, great Optima customer service! (I knocked off one star as I did receive a faulty battery)Last update: Replacement battery just arrived!! Added back a star
Kevin Fontenot
2025-06-12 15:15:26
Works greatUPDATE *** it no longer takes a charge and is useless. Amazon is not helpful AT ALL to get it replaced.
J. Van Landingham III
2025-05-05 17:38:33
I have used Optima batteries on my boat for several years. The batteries deliver good performance and I received 4 years of service out of the last D34M.I ordered a new Optima from Amazon as they offered the best price however the battery arrived damaged as it obviously had fallen out of the bottom of the box. The box was too big for the product, very lightweight, and only had paper wrapped around the battery for padding. UPS attempted to put the battery back in the box and added more packing tape but the battery had been damaged where it hit the ground. Amazon customer service was great in resolving the issue quickly (and at 9:00 pm) by sending me a replacement. Guess what happened to the replacement? Yep, it too was packaged the same (after I specifically asked for better packaging) and had fallen through the bottom of the box, cracking the case. UPS also retaped the box and delivered the second damaged battery.Amazon customer service was willing to send me a third battery but I asked for, and received a refund instead.Now I have two damaged batteries I need to dispose of (the batteries cannot be returned to Amazon as they are considered hazmat).....
keith pumilia
2025-03-14 14:32:35
I bought a boat from my dad a few years ago. I installed a Lowrance elite . The last few trips I went on I noticed that the Lowrance popped up and posted a low voltage warning when I started the motor but went off swiftly when the motor started. I had no problem except was concerned because of the low voltage warnings so I checked the battery connections and noticed the date of the battery was over eight years old . l was surprised because I never had a battery last that long. Because it was in my boat I decided to change it.. But it still is going strong. I shopped for batteries and found some cheaper but if they only last four years old in the long run they would be more expensive due to having to buy two . And I don't want to be stuck in a boat with a cheap battery and having to call for a jump.
Redfield
2025-03-06 17:10:04
Just bought in July 2024 to replace a dead AGM. Battery seems to hold a 12.4v charge when I do not have the battery charger on the boat run. I drained the charge in 2 weeks with just the marine radio idle - not on - which was surprising. But, did let me know the Guest 10 amp charger was toast ( it lasted a surprising 20 years). Running two Humminbird Helix units, starts a Yamaha 150 hp 4-stroke and all boat accessories. Have hit it pretty hard with say 6 hours on the sonar units and so far so good. Will report back, but seems like a good battery and alternative to the newer lithium batteries.
Steve
2025-03-02 10:31:21
Great battery no complaints
Norman Flynn
2025-02-25 10:01:52
Use this batterie on my boat working great
Customer
2025-02-15 09:47:11
House battery for sailboat. Perfect fit. Delivered on time.
jaspinder duley
2025-02-07 12:49:29
Battery does not hold charge. I had Optima batteries before, I only use Optima batteries for my cars and trucks but this time I'm having a bad experience. maybe its cause I ought it on amazon and batteries are old. I had good experience with Amazon too just waiting for their response. Will review again.
Olivier Damiron
2025-01-26 14:49:43
A little powerhouse.
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