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  1. #1
    Seasoned Camper Extreme's Avatar
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    What could this hurt?

    So I'm getting a new 2500RL and been thinking of replacing the Acid Battery with a Lithium 100 Amp, but NOT replace the charger or connection wiring.
    I would for now just keep it as is.

    Now I know that the Lithium Battery will not get completely 100% charged BUT I'm told it could get 85% charged on the standard charger.
    Which would still be much better than what a normal acid battery can achieve at just 85%.

    I'm NOT handy with electronics to install a new Inverter and Monitor, BUT I would be happy with a Lithium Battery that was charged up to 85%.
    What say you? What could this hurt?

  2. #2
    Site Sponsor livinthelife's Avatar
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    Quote Originally Posted by Extreme View Post
    So I'm getting a new 2500RL and been thinking of replacing the Acid Battery with a Lithium 100 Amp, but NOT replace the charger or connection wiring.
    I would for now just keep it as is.

    Now I know that the Lithium Battery will not get completely 100% charged BUT I'm told it could get 85% charged on the standard charger.
    Which would still be much better than what a normal acid battery can achieve at just 85%.

    I'm NOT handy with electronics to install a new Inverter and Monitor, BUT I would be happy with a Lithium Battery that was charged up to 85%.
    What say you? What could this hurt?
    According to my husband, who knows a thing or two about such stuff, that's fine. You may eventually want to have the converter replaced, it's not expensive.
    2017 Reflection 26RL "Mili"
    2016 Ford F250 Extended Cab Gas Engine "Buck" (the truck)

  3. #3
    Seasoned Camper huntindog's Avatar
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    Quote Originally Posted by Extreme View Post
    So I'm getting a new 2500RL and been thinking of replacing the Acid Battery with a Lithium 100 Amp, but NOT replace the charger or connection wiring.
    I would for now just keep it as is.

    Now I know that the Lithium Battery will not get completely 100% charged BUT I'm told it could get 85% charged on the standard charger.
    Which would still be much better than what a normal acid battery can achieve at just 85%.

    I'm NOT handy with electronics to install a new Inverter and Monitor, BUT I would be happy with a Lithium Battery that was charged up to 85%.
    What say you? What could this hurt?
    From my understanding, it will charge a lot slower with the standard convertor due to the LA profile it is using. A lithium charger keeps a consistant high voltage right up to the end.

    As was said, they are cheap and easy to install. Would be worthwhile even if you paid to have it done.
    2021 398M
    2020 Silverado High Country 3500 dually crewcab Duramax Allison

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    Seasoned Camper Extreme's Avatar
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    How long would it take a Inverter Generator to fully charge a 100 Amp Lithium Battery? Or shore power? Regardless of time for charging would the standard acid charger allow the Lithium to get to 100% ?

  5. #5
    Big Traveler
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    The BMS on a lithium battery is what determines the charging voltage. It “lies” to the converter to make it think it needs to keep charging. IMO, the idea that there is a special lithium converter is bogus, because there is no standard for how the BMS works.
    John & Kathy
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  6. #6
    Seasoned Camper Extreme's Avatar
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    Do you think a standard converter could get a Lithium Battery up to 85% charged?
    I know the thinking is since a standard acid battery converter sees a Lithium Battery as always being 100% charged (even when its not due to its 100% continuous output).... so it doesn't see a need to add a charging load to the Lithium.
    What are your thoughts on this?

  7. #7
    Seasoned Camper Extreme's Avatar
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    If you are dry camping, does the Lithium Battery also run both your AC and DC power needs for your trailer?
    I'm under the impression that a Acid Battery only runs your DC power.

    And yes I'm a "big time Newbie" on this whole trailer thing.
    So thanks to all of you for your help on these questions.
    I am suppose to get out 2500RL at the end of March.

  8. #8
    Big Traveler
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    Quote Originally Posted by Extreme View Post
    If you are dry camping, does the Lithium Battery also run both your AC and DC power needs for your trailer?
    I'm under the impression that a Acid Battery only runs your DC power.

    And yes I'm a "big time Newbie" on this whole trailer thing.
    So thanks to all of you for your help on these questions.
    I am suppose to get out 2500RL at the end of March.
    You can’t make general statements about lithium batteries because there is no standardization. What works for one may not work for others. Most are 3.6V per cell yielding 14.4V OCV, so unless your converter provides a higher voltage they may not get fully charged.

    You can install an inverter to provide some AC power, but regardless of battery type it takes a significant bank of batteries to supply much power. You still need a source of power to recharge batteries daily, so you’ll have to have a generator or solar panels to dry camp for longer periods. Air conditioning is a major challenge and is generally not practical.

    My advice is to figure out your rig while you have shore power available, then you’ll know what equipment you’ll want to run when dry camping and can design your off-grid power system to match your needs.
    Last edited by jkwilson; 03-01-2021 at 05:32 PM.
    John & Kathy
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  9. #9
    Seasoned Camper huntindog's Avatar
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    Quote Originally Posted by Extreme View Post
    How long would it take a Inverter Generator to fully charge a 100 Amp Lithium Battery? Or shore power? Regardless of time for charging would the standard acid charger allow the Lithium to get to 100% ?
    The way I understand it, no. The standard charger reduces voltage a time goes by. So it will never get past 85%. This is the same reason it will charge slower.
    2021 398M
    2020 Silverado High Country 3500 dually crewcab Duramax Allison

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    Quote Originally Posted by jkwilson View Post
    The BMS on a lithium battery is what determines the charging voltage. It “lies” to the converter to make it think it needs to keep charging. IMO, the idea that there is a special lithium converter is bogus, because there is no standard for how the BMS works.
    I'd love to see some references on this.

    My charger is very simple it outputs 14.6VDC constantly and forever. Everything else is up to the BMS.

    My understanding is that standard converters output 13.6VDC max. LFP reaches that voltage at a low state of charge so they will never reach their 14.4VDC full state. Check your specific batteries for their charge curve. There are other complexities like equalization that can make things worse. This is the best article I've found on the topic.
    https://glider-battery.eu/post4-1/
    Rick

    2019 Reflection 150 273MK
    2015 Ford F350 CC SB Lariat Powerstroke
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