Car battery recommendations

[TzTz]

Hello,

In these cold days my battery has started to let us down and not start the car. I reckon it's very old and as we're Sunday drivers, it doesn't get charged properly.

Does anyone have any recommendations on how to give this one some new life or models/sizes of new ones?

Car is Micra k12 2003.

Thanks

 

[TzTz]

Ended up going to Halfords. Used one of them chinese li-ion jump starters on Amazon in the meanwhile, cause it was really dead.