Mine is still on the original battery, but the thought of replacing it has crossed my mind. I'll probably swap it out at the end of this year or the beginning of next year, likely for an AGM replacement.
My original 2007 Yuasa made in China is still good too. I charge it once in a while with my desulfator. I did open it to add a bit of distilled water in a cell once. My sitting voltage is still at 12.5.
My original burnt orange 08 is still going but I think its a 2007 according to stamp but in NZ it was registered new as a 08. Never taken the battery out over winter to store it yet and its never gone on a trickle charge.
I am glad to know that I am not alone in depending on an old battery.
I ride sporadically through the winter depending on the condition of the roads. Sometimes - not very regularly - I use my battery charger on the battery and it sometimes performs its desulfating routine.
When it comes to havoc, no one wreaks like me! - Dr. Heinz Doofenshmirtz
I will never be good and that's not bad. - Ban-Anon