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Kiwibirdman

Small size, High CCA battery

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I am looking for a small sized but reasonable CCA (500) battery to put into my EJ Holden. The commodore the engine cam out of has a 550 CCA battery so I want to keep close to that but I don't have a lot of space in the engine bay. 

What have other people used where they are squeezed for space?

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$1927 seems like a bad number for a battery. What are the dimensions of the battery space available? I moved the radiator of my marina over 30mm to accommodate a 600cca battery, simply due to the fact I have a supply of free 3 year old 600cca batteries. Could always relocate to boot but that should be your last option. If your car has less accessories than the donor you can most likely get away with a smaller battery also.

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I seem to recall @Truenotch mounting a small one under his race car seat, or something similar. Might not be him though...

 

/Ling out

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14 hours ago, doullama said:

$1927 seems like a bad number for a battery. What are the dimensions of the battery space available? I moved the radiator of my marina over 30mm to accommodate a 600cca battery, simply due to the fact I have a supply of free 3 year old 600cca batteries. Could always relocate to boot but that should be your last option. If your car has less accessories than the donor you can most likely get away with a smaller battery also.

I was thinking about this, the commodore the motor came out of had everything that opens and shuts, my car has the bare minimum. The big worry for me is having enough grunt to turn it over.

Mounting in the boot is an issue being a station wagon, the spare wheel well has gone for the fuel tank.

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also you need a larger battery for boot mounting to overcome the resistance of 5m long leads. Id just get a good quality battery that makes the most use of the available space, don't forget height too. CCA can be a bit misleading, it is unlikely that you'll need to wind the car over for 30 seconds in subzero temps after all. I've used tiny jap car batteries which would be lucky to have 200cca to start ancient v8's, they'll generally wind over fine - just not for very long. With a modern injected engine (or a well tuned carburetted engine) with a modern efficient starter & electronic ignition this won't be an issue. 

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LiFePO4 all day. I run a small Lithium Iron Phosphate battery in my racecar and it rules. You can leave it for a year or more and it will still start the car (as long as you have no draw / remember to disconnect the battery when not in use. 

My one is a Shorai, but there are various different brands around such as odyssey. I also know people who have used an aliexpress version with great success. 

 

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1 hour ago, h4nd said:

HOw big is the LiFePo you use @Truenotch ?

I'll have to double check, but it's not huge. I think it's rated at about 250cca, but they actually perform much better than a lead acid of the same output, so the CCA ratings can be deceiving. 

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3 hours ago, h4nd said:

HOw big is the LiFePo you use @Truenotch ?

How hard really would it be to make a battery out of a bunch of 18650's?..

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On 19/05/2019 at 11:57, doullama said:

also you need a larger battery for boot mounting to overcome the resistance of 5m long leads. Id just get a good quality battery that makes the most use of the available space, don't forget height too. CCA can be a bit misleading, it is unlikely that you'll need to wind the car over for 30 seconds in subzero temps after all. I've used tiny jap car batteries which would be lucky to have 200cca to start ancient v8's, they'll generally wind over fine - just not for very long. With a modern injected engine (or a well tuned carburetted engine) with a modern efficient starter & electronic ignition this won't be an issue. 

Its an injected 5 litre out of a VT commodore. Should start easily.......in theory. At least it doesn't have the fuel evaporation issues that my Firebird has when left to sit for a while.

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I wanna know more about these Lifepo4's now, unlikely to get one as free batteries are hard to beat but they sound pretty interesting - surviving long periods of disuse would be a big plus

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5 hours ago, yetchh said:

How hard really would it be to make a battery out of a bunch of 18650's?..

Yes, you could, but it wouldn't work as well. LiIon batteries (i.e. 18650s etc) are quite a different formulation to Lithium Iron Phosphate (LiFePO4) - the Lithium Iron Phosphate batteries work a lot better in automotive environments and can be charged by a charge circuit or any regulated / controlled battery charger. 

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1 hour ago, yetchh said:

What about all the ev batteries made out 18650's? .. 

Their charge circuits are a bit more sophisticated than a car that only has an alternator and a voltage regulator. LiFePO4 is less volatile than Li ion and less likely to explode if it's exposed to hot conditions or less-ideal charging situations. 

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Just thinking that if they use them battery drills/vapes etc with high drainage they would be suitable for cars.. Specially a big stack of them

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No, there are many downsides. 

Lifepo4 is the business for automotive use. 

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