Yuasa Battery Date Code

I have had no luck with Google on the 5 digit Yuasa Battery Code

Any one got the secret decoder ring from Yuasa?

My 650 Seca battery has a stamped code of 6K211

My GPz550 battery has a date code of 8C251

Both batteries are the same size and terminal configuration so that is handy for substitution troubleshooting because my Seca 750 has reversed polarity terminals from the Seca 650 and that is a pain!

Thanks!

 

I wouldn't sweat the actual age. I've had motorcycle batteries last anywhere from zero to six years, depending on ME.

Fully charge the battery(s) take to an auto parts store and have it (them) load checked. If they pass, maintain them properly until they die.

I write the date (mo/yr) on every battery, in more than one spot, when I put them in service.

 

Thanks,

I switched the batteries between the GPz and the Seca. The Seca battery is starting to show some sulfation on the plates and the GPz battery looks pretty fresh.

The Seca bump starts so easily it almost left me behind the last time. I didn't expect it to fire instantly, I hope no one saw me trying to climb on as the bike started and took off!
I will have to change that starter solenoid instead of whacking the side cover and getting the solenoid to pull in as I have been doing for a year

 

I wish that the battery manufacturers would adopt an international code for dates, like DOT codes on tires, 09/10 on a battery is fairly straight forward.