Car battery dead

Heiser · 18-02-2019 12:14pm #1

I have a 2.2 petrol car sitting up a about 5 months. Battery is dead. Tried to jump start it from my 2 litre car but couldn't get it started. Eventually started it yesterday using a big diesel van and took it for a ten minute spin and let it tick over for 15 mins. Tried to start it again this morning and it's dead again.

I'm thinking of buying something like this. https://www.argos.co.uk/product/7405392 should that charge it fully? Or should I just get a new battery?

biko · 18-02-2019 12:22pm

Get a new battery.
Next time you park a car for that amount of time you can disconnect the battery.

lalababa · 18-02-2019 12:33pm

Leaving a weak or discharged battery idle during the summer and you might get away with it, but not over the winter. New battery time I'd say.

lalababa · 18-02-2019 12:39pm

lalababa wrote: »

Leaving a weak or discharged battery idle during the summer and you might get away with it, but not over the winter. New battery time I'd say.

That said, I used to use almost completely frigged batteries in solar fences, that seemed to rejuvenate somewhat over time, they held their charge overnight while putting out pulses. Probably not good enough for vehicles anymore though.

Heiser · 18-02-2019 1:06pm

Ok new battery it is so. Would the charger not do enough to charge it up and get the old battery working again?

demanufactured · 18-02-2019 1:16pm

Heiser wrote: »

Ok new battery it is so. Would the charger not do enough to charge it up and get the old battery working again?

It's probably knackered now.

biko · 18-02-2019 3:49pm

Wherever you buy the new battery from will take the old battery free of charge for disposal.

w211 · 18-02-2019 4:15pm

Before buying the new battery, be sure your car working properly. The new battery may be useless investment if you discover, the car does not work at all. Use that diesel van battery for testing. Only if your car are fixed buy the brand new battery. Otherwise you discover, it does not solve the problem, the car will sitting another 5 months and you need again the new battery.

jimgoose · 18-02-2019 4:28pm

Car batteries are not designed to be completely or near-completely depleted (a..k.a. deep-cycle) - they don't like it.

w211 · 18-02-2019 4:36pm

jimgoose wrote: »

Car batteries are nor designed to be completely or near-completely depleted (a..k.a. deep-discharge) - they don't like it.

You can buy the deep cycle battery for car, but it cost several times more money than regular one

jimgoose · 18-02-2019 4:38pm

w211 wrote: »

You can buy the deep cycle battery for car, but it cost several times more money than regular one

That is true, but they also need to be considerably over-spec compared to OE in order to handle the cold-cranking draw. There shouldn't be any great need for a deep-cycle in a regular vehicle, anyway.

w211 · 18-02-2019 4:48pm

Yes these have lower CCA than regular ones.

Bronco Bullfrog · 28-02-2019 2:09pm

If you've not been using your car for a while or you don't use it much I would recommend one of these Allpowers 12v solar chargers from Amazon. It produces 7.5 watts to maintain your battery while your not using the car. I have brought a flat battery back to life on two cars using this, a 2.0 litre diesel peugeot & a 1.6 Petrol Skoda (though they had only just become flat, the cars were not standing for months and months). Also my Dad has one of these, he attached it to his car through the cigarette lighter when he went on holiday. He was away for 25 days and it started up no probs when he got back. (a 1.8 diesel Mondeo).

https://amzn.to/2IGq4zX

Car battery dead

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