Technical Fiat 500 Stop Start Battery

[sammy19]

Hi, The stop start function is not working, I have charged the battery and it did work on the day I reconnected it but the following day it was not functioning again . The battery fitted is a Yuasa YBX7027 12 volt 65amp, is this the correct battery for this car, the battery does start the engine ok at all times but it seems it is the most likely cause of this problem and if I force stall the car it does restart. Any suggestions for a better battery, the one fitted is an AGM.

 

[sammy19]

Should of said Fiat 500 2012.

 

[John202020]

I'd say it's had in terms of stop start, how long is your normal journeys? A guess is its the second battery the cars had so whilst it will start the car may not perform the way it should ?
I use the Batterymegastore for our batteries think Tanya is also a good supplier
Has the engine earth strap been replaced?

 

[sammy19]

Not sure about the strap, will investigate ,thanks for your help.

 

[John202020]

If it's not been done it will need one

 

[sammy19]

What am I looking for with this strap do they fray or become disconnected or loose, I will be looking tomorrow.

 

[chris3234]

What am I looking for with this strap do they fray or become disconnected or loose, I will be looking tomorrow.

They corrod Inside and become very brittle check for any corrosion on the end and flex the cable too see if it's hard and crusty


If one if the open braided types it's very easy to see it

 

[John202020]

It connects between under the battery tray to the gearbox under the clutch slave cylinder

 

[sammy19]

Checked this today, it is not a braided one and it does seem in good condition. What type of battery is recommended for this SS Fiat 1.2, a AGM or EFB it has a Yuasa YBX7027 fitted and it is an EBF.

 

[varesecrazy]

Either.. AGM is better build quality

Ive just bought an AGM for my twinair

£94 and 5 year warranty from Tayna

 

[sammy19]

Hi what was the problem with your old battery mine seems to be a good battery it has no problems starting the car but stop start does not work, it is being used for short journeys only at the moment.

 

[varesecrazy]

My battery is the original factory battery from 2012

Stopstart not worked since circa 2016

Im planning on swapping my 2018 500 battery onto this 2012 twinair..as S-S still works on that 4 cyl engine

The twinair doesnt take much turning.. so a 4 year old Factory FIAT battery should be ok for a few years

 

[varesecrazy]

Stop start is greedy..
It needs the top @15% of the battery charge

If you did a long run.. or charged battery off the car , then S-S would work for a few days

Until you had used that top 15%.. then back to where you are now

Thats still @50% of the battery still in place to start the engine every morning

 

[John202020]

Just buy a new one no swapping around?

 

[sammy19]

My battery is the original factory battery from 2012

Stopstart not worked since circa 2016

Im planning on swapping my 2018 500 battery onto this 2012 twinair..as S-S still works on that 4 cyl engine

The twinair doesnt take much turning.. so a 4 year old Factory FIAT battery should be ok for a few years

I am not sure about about the T/A being easier to turn each cylinder is 437 cc approx the 1.2 cylinder is 312 cc so I would think the T/A starter would have to work harder.

 

[Baughkat]

Do i need to have a s/s battery on my fiat 500

 

[varesecrazy]

That depends..

Does your car have Start-Stop capability..??
I believe early cars didnt

Do you want ... or need Stop-Start..??

 

[jrkitching]

S/S became standard in the UK for 2010 model year cars onward; IIRC it was optional from launch (though not often specified).

The modified rear beam was also introduced at this time, so any car with the modified beam should have S/S as standard.

 

[Baughkat]

Do i need to have a s/s battery on my fiat 500

That depends..

Does your car have Start-Stop capability..??
I believe early cars didnt

Do you want ... or need Stop-Start..??

Hi. My car is 2013. I have a s/s button which I have never knowingly used. My battery needs replacing and i dont know if i need a battery with s/s capability .thank you for replying

 

[Piccolo Nero e Bella]

OEM battery for my 2013 Lounge is an EFB type but a standard battery was fitted (by FIAT!) and the S/S functioned properly for three years until I replaced it with an EFB in 2017. S/S still works properly six years on. The switch is used to disconnect S/S and a yellow warning lamp appears in the top right of the speedo. Sounds like your S/S simply isn't working, probably due to a weak battery.