Most of these wheeled vehicles that get less and less mileage in a rapid manner tend to be just low tire pressures. Low tire pressure requires a lot of energy to roll on. That will be the most likely thing to cause a battery to go dead early. You can't eyeball the tire pressure. You need a tire gauge and a pump.
I don't think a lithium battery in storage for two years is an issue as long as the battery was near 50% charged when you got it. The batteries only get damaged if they discharge to zero voltage while in storage. Normally that is because the device they are attached to will constantly drain it. Like the old Segway's (i2?) do.
Two years of expected use is because there is a limited amount of charge/discharge cycles available for any battery chemistry. In two years, the average user would have put enough cycles on the lithium battery that it should be replaced.
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