Just tried to jump start the mx

[batfink79]

.... And there seemed to be more sparks than usual when connecting the net jump lead to the earth. When it was hooked up there was no sign of life from the car. No lights on the instrument panel, nada!
Any ideas why this may be? The car has been sat over winter, and the battery seems to have gone completely flat. This in spite of it being brand new in sept. It has been jumped recently a couple of times to start it without issue.....

Thanks all for any light you can shed...

[batfink79]

Anyone?