Hi.. lifespan of the battery seems all the same nowadays about 1-2 years.. sometimes 3 years.. it depends on your car electrical system condition and weather condition..

If you stay in hot or Tropical country.. if i may suggest you can use GS Battery.. it's a suggestion only since it is imported and extended with Japan Technology for Tropical country.. used as original battery of most Japanese cars nowadays..

Some of their website that you might visit :

http://www.gs-yuasa.com/jp/index.asp (choose English version on right top)

http://www.youtube.com/user/MrJbusan

Best Regards.