[Noriyasu]

Hi,

It seems that there was a problem with the battery.

Battery may not be reliable enough. SVXs tend to consume more electricity than cars of the same age, putting a strain on batteries and generators.
I prefer Bosch or GS Yuasa batteries with calcium alloys, even though they are expensive. I live at a high altitude and it is very cold in winter. I don't drive the SVX in the garage during the snow season from December to April. Just to be sure, I charge it with a charger about once before spring, but there is no problem for more than 5 years.

Bosch's Hightec Premium batteries were previously made in Japan. Made in Korea now. But the reliability is pretty good. GS Yuasa is made in Japan, but quite expensive.

I don't know much about the high reliability batteries sold in your country, but batteries are a very important part of a gasoline car, so I recommend using a good one. A good battery will help with better ignition, more torque, and the engine will run smoother to higher revs.

Thanks.