yup - keep in mind all systems checks must be done with a known good battery
so, i'd bite the bullet and get a new one if there is any doubt -- rotor and stator failures are fairly rare -- but rectifier/regulator failures are not -- plus all wiring from the stator to the r/r needs to be checked -- burnt connectors are a big problem on "classic " bikes
The busa was having issues, but a new battery and battery tender fixed that right up -- keep in mind superbikes don't charge well at cruising speeds -- usually need at least 4k rpm to get decent amperage
feel free to call me -- you can fly down and feed me or chili's gift cards are accepted
There is no red trolley on draft here tho