Been around the 12 volt for a while. Generally in "auto" they would be putting high amp alternator, upgrade the grounding. Put in an extra battery. Dual battery isolators so would know the vehicle would still start.
Alternators are like 40 to 120 amps and you can easily add another to many vehicles.
But in the case here, stators don't produce that much.

After about an hour or two (haven't put a timer on it) with my bike on the battery tether, the battery is dead.

I am guessing that the battery isn't that well. So when she goes offline for when I install the new exhaust system, ecu, air cleaner kit, and big bore kit. I will replace the battery also.