And what would be the fix for said common fault
Rip out the canister and bypass it.
The manufacturers recommended battery for my Trident 900 was barely up to the job. In cold weather it always struggled or failed to turn the engine over more than a few times. I bought a higher capacity AGM and it was brilliant. Lasted 7 years. I’m on my second now, about 3 years old, never misses. My bike under a cover but on the street.
Also, such a stupid place to have a battery…
That there is a key point. I got very good at removing the panel, attaching the booster clamps and putting everything back together in the morning. But it is such a faff!
Fingers crossed for you it’s the same as mine and the varta keeps going
When I had lead batteries, I added the anti-gravity jump pack harness and had it pop out first under the seat to make it a 10 sec operation.