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Battery Life

Old 03-21-2019, 12:47 PM
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Default Battery Life

I currently have 2 Deka Marine Master 27m6 starting batteries. I have used them for 6 seasons. Every year they are removed from the boat and put on a trickle charger, If I have these batteries load tested and they show all the cranking amps and volts they are rated for, could they be trusted for another season ? Being 6 years old, could they just fail without any warning?


































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Old 03-21-2019, 01:02 PM
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Originally Posted by sjstrz View Post
I currently have 2 Deka Marine Master 27m6 starting batteries. I have used them for 6 seasons. Every year they are removed from the boat and put on a trickle charger, If I have these batteries load tested and they show all the cranking amps and volts they are rated for, could they be trusted for another season ? Being 6 years old, could they just fail without any warning?
Yes. But so could a brand new battery.

What's the point of having two batteries (one being redundant) if not so that when one fails the other can be used to get home on. Then buy a new one to replace the failed one and go from there. When the next one of two fails repeat the process.

By the way, load test the battery yourself. Often if you are suspect of it. Connect it to a good digital multimeter. Pull the kill switch. Crank the motor for 5 ~ 10 seconds while watching the voltmeter.

I am wondering how many perfectly good fuel filters and batteries get replaced long before their time?
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Old 03-21-2019, 01:04 PM
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Buy new ones and sell the old ones, you’d be surprised what people will buy
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Old 03-21-2019, 01:41 PM
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I run a pair of Group 24 starting batteries with a DVSR. I replace both after 5 years of service. Never charged when boat is idled for long periods, only turned off via battery switch.

This setup has never failed.
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Old 03-21-2019, 01:49 PM
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If they are working fine then let it ride. Batteries will give a signs before they crap out.
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Old 03-21-2019, 02:26 PM
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Any battery I've ever replaced has "seemed" like it was getting weaker for a couple months before I replaced them without them failing.
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Old 03-22-2019, 03:50 PM
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You can probably get one more season out of them, but you're pretty much at their usable limit.
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Old 03-22-2019, 03:57 PM
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Just pulled my Interstate batts after 5 seasons. Might have gone another year, cheap insurance to replace them.
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Old 03-22-2019, 04:47 PM
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If you have kept the electrolyte topped up, didn't draw them down too far (50%) and kept them fully charged, they probably have a few more years in them. Failure is driven as much buy charge cycles (300 for flooded) as age.
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Old 03-22-2019, 05:18 PM
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I'm in a similar position with 5 year old starting batteries. I know that I should probably spend the money and replace them. However, they have not let me down. When I winterized my boat, there was no hesitation in starting my engines and they worked as new. If there is no indication of failing, I may keep them for another season. for piece of mind, I bought one of those small lithium jump packs on amazon, so if I got stuck, I can get back to port. If that happens, I will replace both batteries. In the meantime, I can think of other things I can spend the $250 on (for both batteries)

This is the one I have:
https://www.amazon.com/GOOLOO-18000mAh-Starter-Portable-Protection/dp/B078T9P8LS/ref=sr_1_4?crid=3AH863YW66SSX&keywords=gooloo+800a+peak+18000mah&qid=1553300136&s=gateway&sprefix=gool%2Caps%2C239&sr=8-4 https://www.amazon.com/GOOLOO-18000mAh-Starter-Portable-Protection/dp/B078T9P8LS/ref=sr_1_4?crid=3AH863YW66SSX&keywords=gooloo+800a+peak+18000mah&qid=1553300136&s=gateway&sprefix=gool%2Caps%2C239&sr=8-4
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Old 03-22-2019, 05:22 PM
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I’m a lake boater and basically never more than 30 minutes away from getting rescued by a relative. Were it mine, even given my situation, I’m changing them. Old marginal batteries kill starters and charging systems, which are much more expensive than batteries.
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Old 03-22-2019, 09:24 PM
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Quickest way to kill a battery is to either over charge them or drain them below 50% if they are flooded batteries. The batteries can be identical, purchased at the same time, manufactured the same date but they will still have their individual life. I have four batteries on my boat and I use a volt meter to check each one. The different reading on each gives me an idea of which one might be getting weak. Like others have said, batteries will give you some warning signs before they just die.
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Old 03-22-2019, 09:36 PM
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Originally Posted by sjstrz View Post
I currently have 2 Deka Marine Master 27m6 starting batteries. I have used them for 6 seasons. Every year they are removed from the boat and put on a trickle charger, If I have these batteries load tested and they show all the cranking amps and volts they are rated for, could they be trusted for another season ? Being 6 years old, could they just fail without any warning?
The longer you save them, the more new ones will cost.
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