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Which new deep cycle batteries?

Old 07-09-2014, 07:20 PM
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Default Which new deep cycle batteries?

About time to get new batteries. Have the e127, c90, radar, autopilot, 2 electric reel puls and 2 live wells. Currently have 3 with on board charger. SH 27'. Gamefisher. What's the best, longest lasting deep cycles I can get? blue top?
Old 07-09-2014, 11:09 PM
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Well my favourite is Lifeline batteries still going strong on my old sail-boat in extreme heat (up to 110+ Fahrenheit) after now 8+ years. Lifeline has 5 year pro-rated "exchange" warranty.

My experience with Bluetops and a hot environment is not good. Lifetime of 2-3 years. And Ah/lbs is terrible.
Old 07-11-2014, 09:44 AM
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sears platinum diehards, agm, odyssey re-branded by sears. cannot beat AGM and Odyssey.
Old 07-11-2014, 12:06 PM
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Make sure they are all the same type. Lead Acid, AGM, etc. Most likely your charger can only support one kind at a time.
Old 07-11-2014, 03:08 PM
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Originally Posted by ChargerGuy View Post
Make sure they are all the same type. Lead Acid, AGM, etc. Most likely your charger can only support one kind at a time.
Excellent point.

I do not use AGM on a boat that is not going to be heeled over. A sealed flooded lead acid type will work as well or better. Flooded lead acid type do better when they are discharged and then not full recharged before they are again discharged. This is common on a boat and part of the reason for shorter life. AGM perform better at ambient temperatures below 32 degrees but I don't go out boating in weather that cold.

Be sure to get a true deep cycle battery and not one of the hybrid "marine" batteries that are designed to also start the engine. With deep cycle there are ones that are better at full discharges to 50% DOD like the ones used on golf carts and forklifts. These will provide the longest life though they cost more upfront. If used for trolling they are a good investment.

I am amused when someone posts how long their premium priced batteries have lasted. If they looked at it in terms of dollars per month of service they would realize that these are the worst value possible. Even the standard AGM cost nearly twice as much as the FLAT battery and they do not last twice as long nor is the warranty any better. I ignore a pro-rated warranty as it locks me in with a particular brand and that is the last thing I want.

Don't discharge the batteries past 50% and they will last a lot longer. At 50% a 12 volt battery will produce a voltage of 12.20 volts so you can verify with a digital volt meter an know exactly whether you are at this level.
Old 07-11-2014, 08:09 PM
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Thanks great info
Old 07-11-2014, 09:00 PM
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Originally Posted by wintersun View Post
Excellent point.

I do not use AGM on a boat that is not going to be heeled over. A sealed flooded lead acid type will work as well or better. Flooded lead acid type do better when they are discharged and then not full recharged before they are again discharged. This is common on a boat and part of the reason for shorter life. AGM perform better at ambient temperatures below 32 degrees but I don't go out boating in weather that cold.

Be sure to get a true deep cycle battery and not one of the hybrid "marine" batteries that are designed to also start the engine. With deep cycle there are ones that are better at full discharges to 50% DOD like the ones used on golf carts and forklifts. These will provide the longest life though they cost more upfront. If used for trolling they are a good investment.

I am amused when someone posts how long their premium priced batteries have lasted. If they looked at it in terms of dollars per month of service they would realize that these are the worst value possible. Even the standard AGM cost nearly twice as much as the FLAT battery and they do not last twice as long nor is the warranty any better. I ignore a pro-rated warranty as it locks me in with a particular brand and that is the last thing I want.

Don't discharge the batteries past 50% and they will last a lot longer. At 50% a 12 volt battery will produce a voltage of 12.20 volts so you can verify with a digital volt meter an know exactly whether you are at this level.
You do have some rather funny ideas about Lead Acid vs AGM batteries. Where I am in the extreme heat - normal LA batteries requires either a lot of work with adding liquid all the time - or they die within 12-18 months - that is what happens to sealed LA batteries here. Sealed LA does not mean they do not leak or evaporate... You can't buy a LA battery here with a warranty longer than 12 months. Most batteries have "over the counter" warranty - brands like AC Delco Marine has 3 months.....

AGM batteries pro's : They survive more charge cycles, they charge A LOT faster, self-discharge is minimal and can survive a lot higher discharge % before the battery dies out and can't be recharged. They are also harder to break on constant pounding - which is another reason they work well on boats/planes and other vehicles.

AGM battery con's: They are expensive and they might be slightly heavier than sealed LA batteries. In very high & constant drain scenarios (sealed) LA gives better performance (Think Inverters and UPS systems)

There is a reason why the US military uses AGM batteries in many their vehicles - especially the ones operating in high heat. And many golf carts and forklifts now uses AGM batteries too.

But I do agree - quality golf cart and forklift sealed LA batteries are excellent choices as well as they are very high quality batteries.

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