Hello all.I have a john deere mower about 7 years old.Last year the original battery died so i bought a new one.After not using it for 4 months or so,i tried to start it and nothing happened.No clicks,nothing.A friend gave me a battery he had.Mower started right up,i drove around a few minutes..turned it off..tried to start again and nothing happened.no clicks or anything..whats the deal?