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Car battery shelf life

Discussion in 'Motors' started by bainbridge, 22 Sep 2020.

  1. bainbridge

    Mobster

    Joined: 9 Dec 2009

    Posts: 3,615

    Location: Bristol

    My car is 10 years old and I think the battery is too. She started struggling to start in the cold last winter but 24 hrs on trickle charge sorted it and she's been fine since. I'm going to buy a replacement but due to wfh and us having another car which is used daily I'm loathe to fit it straight away.

    The plan is to buy the replacement and keep it in the garage on a shelf and when she starts struggling in the cold I'll swap over then, but if she starts fine over the winter I'll keep the new battery in storage until needed. My thinking is I'd rather store is in a warm (well warmer) garage than on a car that is barely being given a run once per week.

    Will a new battery keep for a year or so with no ill effects?
     
  2. Rroff

    Man of Honour

    Joined: 13 Oct 2006

    Posts: 70,692

    Shouldn't be a problem but I would charge it every ~4 months (preferably with good ventilation though that is less essential on modern car batteries) to maintain condition if you can.
     
  3. BUDFORCE

    Wise Guy

    Joined: 3 May 2012

    Posts: 2,341

    It just buy it like November and change it straight.
     
  4. bainbridge

    Mobster

    Joined: 9 Dec 2009

    Posts: 3,615

    Location: Bristol

    That's exactly when people will be buying batteries because theirs have failed, and the car is hardly being used. Great plan!
     
  5. Semple

    Soldato

    Joined: 5 Mar 2010

    Posts: 7,057

    How long do you intend to keep the car for?

    Considering a battery can easily last 5 years, and are for the most part sub £100, i'm not sure i'd bother with the faff, and just get it swapped over in prep for winter/colder months.
     
  6. BUDFORCE

    Wise Guy

    Joined: 3 May 2012

    Posts: 2,341

    What?

    Is there going to be a car battery shortage?

    ....... actually
     
  7. Mercenary Keyboard Warrior

    Capodecina

    Joined: 4 Aug 2007

    Posts: 10,870

    Location: Wilds of suffolk

    Best time to buy a new car battery is a month of so after the first decent frost
    best chance that its new stock and hasn't sat on the shelf for a year since the first heavy frosts of the prior year
    Obviously more popular models and larger chains should get through and hence rotate stock faster on average
     
  8. Rroff

    Man of Honour

    Joined: 13 Oct 2006

    Posts: 70,692

    Yeah - I don't really see much advantage to not just changing it out - 10 year old car battery that has shown signs of failing could go any time - likely when you need the car the most :s
     
  9. bainbridge

    Mobster

    Joined: 9 Dec 2009

    Posts: 3,615

    Location: Bristol

    Good shout I'll do this, also cheers @Rroff if I end up keeping it in storage past winter I'll give it a top up charge.