Battery Storage

I recently had the opportunity of purchasing a new n70zz starting battery at a really good price, needless to say I took that opportunity.
The existing battery in the vehicle is say 60 % good.
My question is, should I leave the existing battery in the vehicle which should be OK for say 6-9 months and keep the New battery in storage until needed and keep it topped up say weekly on the 5 stage charger or should I just install the New battery and store the old one? If I store the New one will it deteriorate to any great extent?
Cheers ..........Jeff
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Reply By: RMD - Monday, May 20, 2019 at 12:29

Monday, May 20, 2019 at 12:29
Jeff
I would fit the new battery. If the old one is 40% lost already, then with any really cold start you may find cranking volts too low if heaters for cold start are also required. I use a digital voltmeter and see the lowest crank voltage at each start. When below a certain level AND you detect slightly slower cranking sound, it is time to replace the battery even though it sill works ok. A balance between reliable starting and cost I suppose.
50% loss of starting current is closer to what the starter and start aids draws, so it becomes a borderline issue.
AnswerID: 625631

Reply By: Frank P (NSW) - Monday, May 20, 2019 at 13:08

Monday, May 20, 2019 at 13:08
I would fit the new battery and if you have a use for the old one, store it and charge it weekly. If it wont last a week between charges you might as well toss it.

Ahem, recycle it :-)

I have recently dealt with a similar issue. I have kept the old battery for light duty in the garage - pumping up bike tyres, running 12V appliances and chargers, etc
AnswerID: 625634

Follow Up By: Member - Trouper (NSW) - Monday, May 20, 2019 at 13:33

Monday, May 20, 2019 at 13:33
The thing is that the old battery is still cranking OK. I have one of those digital battery testers that you connect to the battery and crank over the engine, it indicates the battery is still good!!! As for winter temperatures, being on the south coast of NSW its not all that cold particularly at the moment (last nite 15 degrees) yes I know it will eventually get colder but if the battery starts to struggle I'd change it. My concern is will the 'new' battery deteriorate quicker in storage if I leave it for 6 months or so.
Cheers
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FollowupID: 899304

Follow Up By: Allan B (Sunshine Coast) - Monday, May 20, 2019 at 13:41

Monday, May 20, 2019 at 13:41
.
Jeff, If you shelve the new battery and keep it properly charged, it should maintain its good condition for well over 6 months.

Cheers
Allan

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FollowupID: 899305

Reply By: RMD - Monday, May 20, 2019 at 14:36

Monday, May 20, 2019 at 14:36
Jeff
I don't like storing any battery, new or old, for months at a time. I use a 240v mechanical timer set to charge for say 5 to 10 min a day so it always has an active electron pass through, on a regular basis. The last battery I changed for much the same reason as you are considering, didn't like being left for a while and then failed shortly after. Although an AGM my 10 year old AGM FullRiver is still going as it receives a regular charge albeit with less capacity now.
AnswerID: 625637

Reply By: Erad - Monday, May 20, 2019 at 14:51

Monday, May 20, 2019 at 14:51
Years ago, our car was about 18 months old when the original battery died. I replaced it with a cheapie, because I was about to be sent overseas for 2 years on a job. The job thingy changed, and I didn't go. After about 2 years, the car needed new rings (a Mitsubishi Sigma). I fitted the new rings in the depth of winter. When I tried to start the car, the battery didn't have enough grunt to turn the engine over, so I had to buy a new battery. I emptied the acid out of the old "dead" battery into a bottle, and kept the battery as a doorstop for the garage door.

Fast forward a few years, and we had a Magna by then. Again, the OEM battery lasted just over the warranty period (1 year) and died. I bought a new Gel battery for the Magna and it worked for about 4 years before it too died. At this stage, as an experiment, I got the doorstop out, filed it with acid and installed it. To my amazement, it worked, and we used it for another 5 years before we sold the car to a young girl. All up, the Magna did 345000 km for us, so it was used almost every day, and I think that is the secret to getting a long life from your battery.

Certainly, if we had simply put the weak battery which couldn't turn the engine over with new rings on the shelf, it would have died within a few months, So if you are going to store a battery, drain the acid out from it and wash it out thoroughly. You have nothing to lose...
AnswerID: 625638

Reply By: Bazooka - Monday, May 20, 2019 at 16:06

Monday, May 20, 2019 at 16:06
Just a thought but if you're happy with the old battery why not keep it, onsell the new to someone who actually needs it, and pocket the small profit?
AnswerID: 625640

Follow Up By: Member - Trouper (NSW) - Monday, May 20, 2019 at 16:22

Monday, May 20, 2019 at 16:22
I think I'll store the new battery and ensure it is kept charged via the 5 stage charger. It'll probably be for 5-6 months only
Thanks all for the comments

Jeff
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FollowupID: 899310

Follow Up By: Lowan - Friday, May 24, 2019 at 16:32

Friday, May 24, 2019 at 16:32
Yep stick a small solar panel on it and it will last five years at least.
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FollowupID: 899363

Reply By: Michael ( Moss Vale NSW) - Monday, May 20, 2019 at 20:55

Monday, May 20, 2019 at 20:55
Fit new toss old, doing anything else will be time consuming and will let you down. Michael
Patrol 4.2TDi 2003

Retired 2016 and now Out and About!

There's time to rest when you're dead,
Get out and do something instead!

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AnswerID: 625651

Reply By: TerraFirma - Tuesday, May 21, 2019 at 15:22

Tuesday, May 21, 2019 at 15:22
Sometimes the older battery can be used to run a fridge etc. Definitely put the new one in.
AnswerID: 625661

Reply By: 9900Eagle - Tuesday, May 21, 2019 at 18:30

Tuesday, May 21, 2019 at 18:30
Just put the new battery in and donate the old one to simsmetal. You will just get caught using the old one, it has done it's time.

AnswerID: 625663

Follow Up By: Griffin - Wednesday, May 22, 2019 at 08:16

Wednesday, May 22, 2019 at 08:16
How hard are you going to kick yourself in the arse when the current one lets you down at the most inopportune moment?
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FollowupID: 899329

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