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Thread: 100Ah LiFePO4 Lithium Batteries.

  1. #41
    Join Date
    Jan 1970
    Location
    NSW South West Slopes
    Posts
    10,323
    Hello Tim,
    I'm looking for a replacement for a dead Remco 100DC aux battery which has lasted just on 5 years mounted in a rear corner of my L322. It has been charged by the car's alternator via a VSR. A manual switch is fitted to allow direct connection to the starting battery for when the starting battery is too low and this facility has been used a few times.

    I've not previously followed any lithium battery discussions but I've spotted adverts stating that they're a drop-in replacement for lead acid batteries. Do you have any comments for such a use with my application?
    Thanks.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  2. #42
    Join Date
    Jan 1970
    Location
    Queensland
    Posts
    7,167
    Hi Graeme, at this point in time, I would not be too quick to fit a Drop-In type lithium battery until all the facts are in about whether they are compatible with all the different vehicles out there.

    As for the so called “Drop-Ins“, they don’t explain how you need to set them up.

    If you use a standard VSR isolator, because a lithium battery has a settled voltage of 13.2v or slightly higher, and because an isolator needs to see a voltage of 12.7v or lower before they turn off, the isolator will not turn off until the lithium battery goes flat.


    In the mean time, the lithium battery will continually back discharge into the lead acid cranking battery.


    This is great for the cranking battery as it will always be fully charged, not too sure how the lithium battery will stand up to that sort of use long term.


    Other possible problems are that some vehicles with smart alternators run at as low as 12.4v, but the lithium battery will keep the operating voltage at around 13v.


    This could mean the vehicle’s Battery Management System will see the higher voltage and either cause error messages or will not try to charge the cranking battery until the lithium is again flat or near flat.


    In this situation, the cranking battery should stay charged.


    As above, too many unknowns yet.


    The safest way to use a lithium battery is to keep it separated from the cranking battery and charge the lithium battery with a DC/DC device.


    Personally, IMO, just a lot simpler to fit another lead acid battery for now.

  3. #43
    Join Date
    Jan 1970
    Location
    NSW South West Slopes
    Posts
    10,323
    Thanks Tim. I hadn't thought through that the higher Lithium voltage would keep the VSR connected and therefore would be an unsuitable configuration, let alone the possible affect on the charging of the main AGM battery.

    I've been alerted to the cheaper Fusion 100ah agm the same physical size which solves the issue of the Remco's high cost yet only 5 year life from the old one that was making me consider the Lithium. Whilst the aux battery gets regular use, the 100ah capacity is only used on the very rare outback trip so there's no justification for an expensive battery.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

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