I was taught that a storage battery refers to any battery that can be re-charged, as compared to single use disposable batteries.
8 or 9 years out of an original motorcycle battery is not at all bad, it will be interesting to see how long the replacement lasts. I think the lithium batteries that came in my TRS are going to be lucky if they last half that time. Note that Lithium batteries should not be charged in sub-zero temps, you might want to take that into consideration if your plan is to continue leaving it in unheated storage, best to not leave it on a charger over winter. You're not suppose to long term store lithium batteries at 100% charge.
8 or 9 years out of an original motorcycle battery is not at all bad, it will be interesting to see how long the replacement lasts. I think the lithium batteries that came in my TRS are going to be lucky if they last half that time. Note that Lithium batteries should not be charged in sub-zero temps, you might want to take that into consideration if your plan is to continue leaving it in unheated storage, best to not leave it on a charger over winter. You're not suppose to long term store lithium batteries at 100% charge.