Actually it's normally only necessary to recharge lithium every 2 months or so.
In fact most lithium cells don't self discharge at all, a characteristic fairly unique to them, but the control and balancing circuits built up batteries contain create some small leakage, hence the need for occasional charging.
Temperature also controls the loss of capacity over time, and it's only about 2% in a year at zero degrees C, so much depends on where that battery has been kept, in a cool room or a baking hot garage making quite a difference.
So the battery could still be good, and if a charge gives a reasonable range its going to be perfectly alright. On balance it's probably going to be ok, but I can't be more certain without knowing at least the original quality and the exact circumstances of storage.
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