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Anything drawing down the battery while the bike is parked and idle?

The most sure way is to measure the current draw at the battery (no key in the ignition). If, for example, the draw is 100 mA, that could be one explanation for "battery let down". That is, a parasitic load is drawing down the battery. It could be an electronic accessory, a weak short somewhere. Nevertheless, it might be worthwhile to quickly check that. Maybe the battery is actually okay.

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Example case:

Spouse bought a cage and the battery would be weak after two weeks of being idle. The battery was replaced, but it happened again when the car sat idle for about two weeks. I found a parasitic optional accessory that was drawing 250 mA from the battery. I removed the accessory and the battery was fine forever more.
 
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