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Thread: Lithium Battery Capacity

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    Default Lithium Battery Capacity


    I'm considering upgrading to a pair of Valence 40ah lithiums, these are used medical batteries that are fairly inexpensive.

    I've been doing some reading, and saw (from lithium sellers, mostly) that lithiums offer 100% of available capacity, while lead acids offer only 30-50%. That would mean my current ~100ah batteries have a useful output of 30-50ah, so the smaller lithiums are equal.

    Is that true though? I always thought amp hours were calculated using the normal discharge limits of the battery, not pulling it into damaging territory.

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    It really depends on what you are using them for. Mostly it is BS. You can generally use 70% of a standard lead acid battery. The difference is that the voltage on a lead acid slowly decreases as it discharges while a lithium stays fairly flat then drops off suddenly.

    The idea that draining a lead acid below 50% damages it is 100% balogna.
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    Lithium is a good source of power, my only concern is you have a very small window of when its got output and when its over, and I mean now.

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    Quote Originally Posted by CatFan View Post
    It really depends on what you are using them for. Mostly it is BS. You can generally use 70% of a standard lead acid battery. The difference is that the voltage on a lead acid slowly decreases as it discharges while a lithium stays fairly flat then drops off suddenly.

    The idea that draining a lead acid below 50% damages it is 100% balogna.
    That's kind of what I thought.

    I'd be using them for a 24V Terrova, I've got two Walmart 29DCs in there now, 100 amp hour batteries. One of them is a few years old and I'm not sure that it'll make it through the season.

    Lithium dealers make it seem like you can downsize quite a bit and still have the same capacity, but it doesn't seem to add up to me. I don't want to get those 40ah batteries and end up with way less run time.

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    ACC Crappie Stix just put out a good read on traditional batteries vs lithium’s.


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    You will find that lithium battery manufacturers and sales people will try and sell you on the weakness of wet cells over lithiums maintaining a constant voltage charge until a lithium has used around 80% of its amps and then the voltage will start to drop. I read that in all the forums. What I don’t hear is the argument of AGM batteries vs Lithium in voltage drop issues. There aren’t a lot of discussion and maybe it’s cause the guys using AGM’s haven’t decided to switch to lithiums as of yet. There are a heck of a lot of guys that tourney fish using 2-50 amp lithiums for 24 volt TM’s and 3-50amp lithiums for their 36 volt trolling motors and they charge them each time they use them on a daily usage. However,,it depends how much your using your trolling motor. If your constantly longlining jigs or Crankbaits all day long then go with 100 amp batteries. Most that do,,only have to charge them every couple of days of serious fishing that way. What sells me in the lithiums I have,,,is no voltage drop means I have no issues with my electronics if the voltage were to drop using wet cells. I have as strong running trolling motor from the time I turn it on,,till the time I turn it off and never have to turn the speed up as I used to have to do in using wet cells. Never have to worry if the batteries need water. Have no issues with corrosion of battery terminals either. Super light weight vs wet cells. Charge alittle quicker. Never a voltage drop when stored for any length of time. My lithiums have not lost 1 amp stored all winter and don’t need charged when I finally have no ice and will hook the boat up next week to fish. And at 71,:the lithiums will outlast me in all probability and I will never buy batteries ever again.

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    8 yr warranty on my Ionics, 10 yrs on Battle Borns

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    I just ordered a couple of 60 amp lifepo4 from Amped Outdoors. I bought them cause they are compact and lightweight. I will be replacing the Everstart 27s which have been in use since 2013. At my age, cost is not relevant.
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    Cevans, very impressive informative information you gave on the lithium battery vs wet cell. I am interested in moving from old technology to new. But at 61 I find myself a bit skeptical as always. But your response on this has really got my attention and thank you. But I do have a few questions if you find time to answer them. What type battery charger do the lithium batteries take? How long does it take for them to charge up? Can my same on board charging system be used that I use for wet cell batteries? The other selling point to me is I still fish out of heavy aluminum boat this is due to fishing rivers with lots of unexpected floating logs that can be just under the water. Battery acid and aluminum can be an issue if not contained.
    Finally what’s the best way to figure out exactly what you need and how to keep expenses down while making the change? Oh in one more how often do you have to replace these? On wet cells I can get anywhere from two to five years out of my wet cells. That really depends on up keep and brands.


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    I was using a ProMariner 20 amp 2 bank charger for charging wet cells..Reset it to charge AGM batteries and it charges my Lithiums to 100 percent. Charging each battery at 10 amps takes a couple of hours when at 60-70% to 100%. With lithiums,,you do not have to charge them to 100% if you don’t want to. Sometimes after 2 days of running trolling motor,,I may be down to 45-50% used. I also use a 1 bank NOCO lithium battery only charger for the 100 amp electronics and to run/start my 25 electric start motor. It only drops about 20 percent per day usage as I don’t run long distances with motor to charge it a lot. Electronics on boat are a 9 MSI g2n, 10 MDI g3n, 12 MDI G4N, mega 360, network, gps puc, trim tilt plate, 25 motor, lights in boat and builge pump. I don’t have a live well as use cooler for fish. I also plug in phone and iPad most days. A lot of wet cell chargers that have a AGM setting on them will charge certain lithiums, you just have to check with the manufacturers of them. You can also use a 20 amp, 30 amp charger per bank in lithiums to speed up charging times. I could have gotten cheaper batteries from Amped but wanted the phone app that Ionic has Bluetoothed into their batteries. It gives me total info including hours/minutes left in them while using, how many amps I am pulling or charging, how many hrs/minutes left to charge when charging. Monitors each cell constantly, also gives battery tempature and voltage your charging at as well as volts your pulling at while everything turned on and a,bit,of other info also. Right now,,I think due to manufacturing issues due to Covid 19,,and demand,,,battery prices are not dropping and remaining constant. Look for deals and discounts in buying batteries. Also,,lots of chargers being manufacturerered today and more being considered and made as time progresses at all price ranges. One other thing about lithiums,,no liquid in them,,so if needed,,you can mount them on their side, upside down, or stacked on each other. These new lithiums now have improved BMS management system installed in them to prevent over heating, fire, and over charging as well as are managing the output in a constant voaltage and will automatically shut down the battery or charging. One other thing about a batteries BMS system. If using a 12 volt trolling motor, you can hook a 100 amp battery, a 50 amp battery, a 30 amp battery in parallel,,,and the bms will equally charge all at the same time as well as you can use them on a trolling motor at the same time and for example,,the 30 amp will last as long as the 100 amp hooked in parallel. Same if I hooked a 50 amp in parallel to a 30 amp for electronics giving me 80 amps to run electronics as the BMS systems works to equal out the used amps when using or charging. I may be using 2 amps of the 50 while only pulling 0.5 amps out of the 30 keeping each battery equal in the amount of power left in each. I have been experimenting using different battery sizes in finding this info out and discussing this with Ionic and it works as well as they confirmed this prior to my experimentation so the combinations are unlimited when in parallel. If buying a 24 volt or 36 volt lithium,,,you will need a 24 volt or 36 volt charger.

    if you call some of these manufacturers and sellers,,they can pretty much tell you what you can get away with as far as size of battery. If your a heavy user of trolling motor,,then go bigger,,,some manufacturers only make 20, 30, 50, 100, and 125 amp. Some make 60 amp and 80 amp. Some make 60, 80, 100, and 125 amp starting batteries also. I think Battle Born and Ionic also make a lithium battery that has a built in heater for the guys that fish in below freezing temps. There a bunch of combinations. Also,,check out bbc forum in their Electronics/Trolling Motor forum section..and go back a few pages scouting to the many different questions and answers on lithium batteries that users are asking. Electrical/Wiring/Trolling Motors

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