How to charge a deep cycle battery

Discussion in 'Boat Tips' started by flathunter, Feb 12, 2006.

  1. flathunter

    flathunter New Member

    Messages:
    5,723
    State:
    Ohio
    I just bought a new charger, and it has two settings 10 amp and 2 amp..which setting should I use? It also has automatic shultoff.
     
  2. Itch2Scratch

    Itch2Scratch New Member

    Messages:
    1,662
    State:
    Ivy Bend on LOZ, Missouri
    On a Deep Cycle only use the 2 amp for a trickle charge.
     

  3. Kutter

    Kutter New Member

    Messages:
    5,379
    State:
    Arnold, MO
    Kens right, the 2 amp will do a much better charge. The 10 amp will work, but the charge won't be as good. Something about long slow charges giving you long slow discharges, short quick charges gives you short quick discharges. At least, that is what the batteries say on the paperwork that comes with them.
     
  4. fwmud

    fwmud New Member

    Messages:
    693
    State:
    Wilson's Mills,nc
    Jack, it's
    according to what type of charger it is.
    Here's the basics of electricity;
    When you charge a battery at a high rate(fast charge at higher amps) the battery heats up. This causes more resistance(Ohms). The heating up will cause the battery not to "accept" a full, complete charge.
    Thats why they told you to "trickle charge" it. Trickle is slow and makes less heat, which allows a more complete and better charge.
    Hope this helps bro.
     
  5. Nobody Special

    Nobody Special New Member

    Messages:
    614
    State:
    TN
    I disagree. The 2 amp setting is for lawn mower and motorcycle batteries. 10 amps is about right for a deep cycle battery. Look at some of the battery manufacturer's websites. If I'm wrong, I'll lay my head on a block of wood and let you chop it off.
     
  6. dademoss

    dademoss New Member

    Messages:
    524
    State:
    Ohio
  7. Nobody Special

    Nobody Special New Member

    Messages:
    614
    State:
    TN
    OK, I looked it up. They say to use the 20% rule which means the charger rate in amps should not exceed 20% of the amp hour rating of the battery. For example, a 100 amp hour battery should use a 20 amp charger maximum.


    They also say it is best slow charge the battery. By slow charge, they mean you should use a charger that is adequate to recharge the battery within 10-12 hours.

    (interstatebatteries.com)
     
  8. malaki

    malaki New Member

    Messages:
    149
    State:
    Redmon Illinois
  9. Itch2Scratch

    Itch2Scratch New Member

    Messages:
    1,662
    State:
    Ivy Bend on LOZ, Missouri
    LOL..Only on BOC can you get such a debate on everything..LOL...yes you can charge at a higher rate, however, as Kieth said it heats up the battery. I always trickle charged mine and my friend didn't, mine always lasted on average twice as long as his. I guess if you can afford to replace batteries more often it would be handy, but I operated miserly.
     
  10. jim

    jim New Member

    Messages:
    2,579
    State:
    Jacksonville NC
    I don't think anybody said "It depends "on what kind of battery.When you read 'Do not fast charge" it generally means that deep cycles should not be charged on automotive type chargers,which replicates the use in a car.High fast bursts of amps to maintian full charge.If you notice most of the on board chargers have banks 1-2 or 3 depending on how many batteries you have.Most of the time each bank is ten amps but they do go higher.These types of chargers monitor the batteries condition,temperature.line voltage etc and shut down when fully charged.Batteries tend to lose 1% of charge per day when in active.The on boards turn back on when the voltage level falls below a certain point.Dual Pro which I have says,"The pro series incorporates higher potential amperage outputs up to 15 amps which allows a battery to recover faster than ever before".So Jack if you have a standard battery with liquid electrolyte,you can overcharge and boil it away even on 2 amps.The secret is to NOT overcharge,and even trickle chargers will do this to standard batteries if left on indefinitely.Thats why the best investment in battery chargers is one that monitors the battery,supplies the needed amperage,which usually decreases as the battery nears being charged,then shuts off completely,monitors and turns back on when the battery falls below a certain level.Go to Trojans website or any battery and or charger website for detailed info.Jack if you have just a normal charger the secret to long life is shut it off once the battery is charged if it doesn't do so itself and secondly always recharge immediately after use as delay causes sulfation of the plates.:)
     
  11. flatheadhunterx

    flatheadhunterx Active Member

    Messages:
    1,374
    State:
    South Carolina
    i just got a charger because i am the worlds worst at ruining batteries. this charger charges at 2, 10, and 25. it monitors the charge on the battery and drops during the charge so it doesnt over charge and checks temp if it gets to hot it slows down till battery cools off. you can recondition batteries with it, and also equalize a battery. its pretty neat. i had 1 battery i was going to discard because it wouldnt take a charge, but i reconditioned it twice and the it took a full charge. also a guy that works at battery specialist here told me that it was good to completely discharge a battery from time to time and then recharge to a full state. it helps the battery last longer.
     
  12. jim

    jim New Member

    Messages:
    2,579
    State:
    Jacksonville NC
    Flat,good point.One thing that Trojan told me is that all regular liquid elctrolyte batteries need a good equalizing charge occasionally.This blows the sulfation off the plates.Most batteries die of sulfation and one way to bring them back is with an equalization charge or a pulse charger.We in the military discovered solar powered pulse chargers a long time ago and I have two that I keep hooked to my batteries when not in use.They provide tiny pulses of juice to the battery which knocks the sulfation off the plates.Solargizer is the name brand.Minnkota also makes a liquid formula that re conditions batteries and removes sulfation which you can buy at Walmart.:)
     
  13. Itch2Scratch

    Itch2Scratch New Member

    Messages:
    1,662
    State:
    Ivy Bend on LOZ, Missouri
    Great input guys, I am sure this will help Jack. The one I use is a vari-amp but I only charged 24 hours and then checked it periodically to see if I needed to add charge.
     
  14. kspor

    kspor New Member

    Messages:
    716
    State:
    Wichita Kansas
    Make sure if you let your batteries get low that they dont freeze. NEVER try to charge a frozen battery. Kaboom is never good to hear or have a face next too.