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Thread: iTech120 Lithium battery

  1. #11
    Join Date
    Sep 2014
    Location
    Hunter Valley NSW Australia
    Posts
    34
    There are two reasons to use a DC to DC charger to charge lithiums from a vehicle, one is to get the voltage correct, personally I won't charge my lithium to anything higher than 14.2 and the bigger reason is to prevent alternator meltdown.
    As you probably know a lead acid battery's internal resistance rises as it approaches "full", from about 75-80% state of charge it rises quite steeply which in turn limits the amount of charge amps it can accept and which the alternator supplies.
    Lithiums have a very low internal resistance and will accept whatever the charging source can supply so in the event the alternator is rated at 100 amps then the lithium battery will accept that until full.
    Most alternators cannot handle running at full output for any length of time without internal temperature rising which in turn limits the output current if it is fitted with thermal protection or if not can sometimes lead to total alternator failure.
    Many 240v chargers also suffer the same problem when used to charge lithiums especially larger capacity banks.

  2. #12
    Join Date
    May 2003
    Location
    Sunny Coast QLD
    Posts
    27,775
    Lithium Vs Lead Acid >> Marsen

    well that ^^^ has convinced me,,
    not sure I'll implement it in this van though...
    "How long since you've visited The Good Oil?"

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  3. #13
    Join Date
    Oct 2014
    Location
    Brisbane
    Posts
    3,337
    The sales blurb for the lithium battery linked in OP indicates it has a built-in BMS of some sort, enabling it to be directly replacing an AGM unlike a typical lithium battery by itself.

    Scott
    D4 TDV6 MY14 with Llams, 18" Wheels & BFG KO2s, Traxide DBS, Drifta Drawers, Rhino Platform, APT Sliders & compressor plate & Mitch Hitch
    Link to my D4 Build Thread

    Ex '77 RRC 2 door. Long gone but not forgotten.

  4. #14
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    6,775
    Hi Scott, just about all lithiums these days, come with their own builtin BMS.

    It is the quality of the BMS that can make a difference as to what battery is better than another.

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