What is hard starting? Long crank times? If it has set for awhile even my 2021 cranks a bit longer. Do you keep your battery on a tender? Do you use your Rube for a longer time once you start it up or is it just short trips. Lots of variables towards determining battery health. Mine are usually on a tender and get used frequently. I expect a good 5 years out of the batteries. I have better length out of the Duracell Ultra from Batteries Plus here in the USA on my 2003 & 2004. The 2021 has the factory battery still.