2017 volvo S60 T4 aux battery replacement after 7 years

not a scientific measurement, but I do feel that my battery system seems to draw more currents on charging system. By feeling the vibration and the temp of alternator.

2024 I tested my original aux battry, the interenal resistor rised to 23.3 mOhm


Based on the manual, this one has to be AGM one, search my local netshoping, 

the volvo brand one is about 5000NTD, and it's made of china, with varta/fiamm it would be 3000~2000NTD.

I found Yuasa AGM YT12B-BS, CCA 210, at 1300NTD and made in Taiwan. ahthough the dimension is slight different, Yuasa one is slightly smaller. it should fit.

It comes with battery fluid seperated, but with clear explaination and steps, no problem on this, but still being very careful since it's strong acid.

steps are well noted.
the acid flude are designed to fill in to 6 cells
the black one is the cap of battery, do not open the aluminum caps.

the inlet is designed with slop, where can easily cut through the fluid caps

I use a plastic container and glove to prevent accident.
firmly push through the caps.

the air conduct design will slowly flow acid into battery, wait for it. you may need some tape in it.








after filling the acid, the battery will slightly warm up, few bubbles as well.
put the cap back, the battery is ready to be used.
The internal resistor is measured at 8.41 mOhm
For the installation on the car, since it's smaller, I added a core on the back, but if you see the deisgn of volvo bracket, even without core, it could fix the battery in place.


























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