answer:It may have over-drained the battery. What is the charger style? Does it happen to have a male USB end, that you can plug into a computer? Sometimes, an over-drained battery doesn’t have enough of a charge to accept a high flow of energy from a wall outlet, but you can charge it through a secondary source, like the USB port of your computer, which and it’ll take it. No guarantee it will work (2 years is a long time to keep a battery dormant) but it might be worth a try.