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Batteries

Discussion in 'Technical Discussion' started by Scott M, Mar 2, 2017.

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  1. Capt J

    Capt J Senior Member

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    It sounds to me like the boat has a charger issue and it fried the batteries. I think lifelines have a 7 year warranty.
  2. ranger42c

    ranger42c Member

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    Might also depend on what brands that battery store sells. And how much granularity in their battery tracking system (brand and type? or just type? or...?). Apparently, there are AGMs... and then there are good AGMs...

    I think that'd be my first guess, too. Second guess might be they weren't sufficiently recharged after each cycle...

    Or maybe some combination of stuff like that...

    -Chris
  3. bayoubud

    bayoubud New Member

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    It could be a charger issue. The Lifeline warranty is 5 yr. with proration from 3 to 5 year. No doubt they are a top quality battery. I look at longevity vs cost and have not seen where AGM's outlast wet cell if properly maintained. Just priced AC Delco 8d wet cell @ $190 each x 10 = $1900. Lifeline 8D @ $750 x 10 =$7500. Plus labor on both. I guess my question would be "will they last 3 times longer"? I do understand that many do not maintain wet cells properly(if at all) and in that case a maintenance free battery would be the best choice. Also, a charger issue can kill your batteries at any time. Just saying it is hard to justify the difference in cost with all the possibilities of short battery life. Most boats I have owned needed batteries and/or chargers replaced.
  4. Capt J

    Capt J Senior Member

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    I agree, hard to justify the price difference. However when you compare regular AGMs (deka etc. ) at $250 each versus $190 it makes more sense if you're paying someone else to add water to wet cells, they're in a hard to access location, or the motors(verados for example) or location require them. I've found normal AGMs say deka versus deka, last about 10% longer than lead acid.....maybe a touch more.

    I've also seen chargers go bad and completely fry a 3 month old set of AGM's, same as lead acids too.
  5. bayoubud

    bayoubud New Member

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    I also agree with you with that price comparison for AGM maintenance free. Not much of a premium to pay. I was comparing the existing Lifelines to wet cell which was a no go. Thanks for that info, have not shopped the different AGM's yet.
  6. DOCKMASTER

    DOCKMASTER Member

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    I switched both my starting and house banks to AGM five years ago and couldn't be happier. Starting are 8D's and house are group 31. The house are Trojan and I can't remember the starting brand. I had somebody accidentally turn off the house bank charger and the batteries were drawn down to zero. Charged them back up and they have been working like new. That was two years ago. I also like the zero maintenance on the AGM's.
    I have switched my motorhome house batteries to AGM and I have a large AGM battery bank for a weekend cabin that is off grid. I am extremely pleased with AGM's all around. I think they are well worth the added cost.
  7. ksbguy

    ksbguy Member

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    I agree with you there and that's why I still use the lead acid batteries. I also don't understand worrying about acid spill. If the batteries are not over filled you'd need some serious pitch and roll angles for the acid to come out of the batteries. Sure they will gas a bit when charging but is that really an issue if it's in a ventilated engine room? Take a wet battery at proper level and look at how much you need to tilt the battery before the acid comes out, at that point you got bigger problems because the coast guard is on it's way :)
  8. ksbguy

    ksbguy Member

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    I have a bank for four group 31 lead acid used for the house I bought at napa for 100 bucks each. Deka makes the deep cycle group 31 batteries for napa so it's the same battery just less $$.
    They are now going on 7 years of discharging to 50% every weekend (just about) during season (about 7 months - I'm in the north east) and still have plenty of life left.

    I water them once a year at the end of the season and they don't really need to be watered.

    It's all in the float voltage of the charger. If the float voltage is too high (typically 13.3v for lead acid) it'll cause gassing and you'll be adding water more often. If the voltage is too low, I think < 12.8v you'll start to get sulfation on the plates and they will loose capacity.
  9. ranger42c

    ranger42c Member

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    Reading suggests AGMs can be easily killed, too, apparently by lack of sufficient recharging after a discharge cycle.

    In that case, I think I'd not consider them "maintenance free" -- just the "maintenance" (expeditious recharging to 100%) is different compared to wet batteries.

    -Chris
  10. bayoubud

    bayoubud New Member

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    I am still looking for those $250 8D AGM's. :confused:
  11. Capt J

    Capt J Senior Member

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    Ohhhh, not 8D's, I thought you were talking about Group 31's.
  12. bayoubud

    bayoubud New Member

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    I wanted your source! lol

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