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Reviving a two year old car battery

  • 06-03-2021 8:46am
    #1
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,888 ✭✭✭✭


    Battery 2 years old, car unused for last year due to passing of driver.
    Battery flat.

    Charger shows 13.5V when connected.
    Car started 1st turn from jump leads.
    any way to revive battery?
    Thanks as always

    “I can’t pay my staff or mortgage with instagram likes”.



Comments

  • #2
    Atlantic Dawn
    Registered Users, Registered Users 2 Posts: 84,761 ✭✭✭✭Atlantic Dawn
    M


    Connect it to a charger overnight to fully charge and see how you get on. Other option would be after jump starting to bring it for an hours drive and keep it in daily use so it replenishes.

    What are your plans for the car after you have it charged? At the end of the day even with a brand new battery if you are planning on just leaving the car laid up for another few months the battery will eventually discharge fully again.


  • #3
    mk7r
    Registered Users, Registered Users 2 Posts: 839 ✭✭✭mk7r


    When they are dead they are usually dead, certainly not reliable


  • #4
    newmember2
    Registered Users, Registered Users 2 Posts: 2,599 ✭✭✭newmember2


    Calahonda52 wrote: »
    Battery 2 years old, car unused for last year due to passing of driver.
    Battery flat.

    Charger shows 13.5V when connected.
    Car started 1st turn from jump leads.
    any way to revive battery?
    Thanks as always

    What did the battery read before you connected the charger? Depending on how discharged it was it might be salvageable with a decent charger.


  • #5
    btree
    Registered Users, Registered Users 2 Posts: 29 ✭btree


    No. You could save this 2 years old battery by pulse charging function. Saw in Lidl selling for around €20.
    mk7r wrote: »
    When they are dead they are usually dead, certainly not reliable


  • #6
    whizbang
    Registered Users, Registered Users 2 Posts: 1,974 ✭✭✭whizbang


    Worth trying to 'excercise' it. Charge and discharge repeatedly over a short time, it may come back enough to get the car sold ;)

    It needs a fairly heavy duty charge to kick it off. Maybe jump to another car, then discharge it quickly. Repeat multiple times, then 24Hour charge.

    But as above, When they are dead they are usually dead, certainly not reliable.


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  • #7
    Rodin
    Registered Users, Registered Users 2 Posts: 3,130 ✭✭✭Rodin


    Calahonda52 wrote: »
    Battery 2 years old, car unused for last year due to passing of driver.
    Battery flat.

    Charger shows 13.5V when connected.
    Car started 1st turn from jump leads.
    any way to revive battery?
    Thanks as always

    Make sure to have safety goggles when you go to jump it.


  • #8
    Deseras
    Banned (with Prison Access) Posts: 49 ✭Deseras


    Make sure water is full add distilled water
    Trickle charge over night make sure connections are tight


  • #9
    frosty123
    Registered Users, Registered Users 2 Posts: 565 ✭✭✭frosty123


    Epsom salts and bottled water


  • #10
    BavarianCare
    Registered Users, Registered Users 2 Posts: 111 ✭✭BavarianCare


    Professional chargers do have a 'refresh' option.
    They CAN revive a battery but it is usually fruitless - you get a month or two.
    With AGM/VRLA batteries you're only messing up the IBS.

    Basically:
    If a battery is severely discharged (regardless of age) which means <11.8v then it is damaged.
    It may be ok ('ish') but NEVER correct.

    JUst buy a new battery - and not a cheapo.
    I've had customers who supplied new batteries that have failed within weeks...

    There are good quality brands but I do not know if I'm allowed to say which on this forum.

    PS: It is VITAL with modern cars to ensure the battery tech matches what the vehicle expects. With BMW it is possible to change the car to match the battery if required but it is a complete reflash of the vehicle and that usually negates any saving.


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