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Yeah, lead-acid batteries self-discharge when sitting around. Remember that old-mechanic/wives' tale about leaving batteries on concrete floor causing them to go flat? It's not concrete, but letting them sit not on tender that caused problem. And batteries on floor are more likely not to be used and charged. It only takes 4-6 months of sitting around for fully-charged battery to get completely discharged and destroyed.
To verify dead batteries in this case, is to jump-start bike from confirmed good auto-battery (one that starts car). Leave car off when jumping, and wiggle jumper-cable clamps to get good bite. Then start bike.
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