You need a new battery or try checking the acid in the battery cells. Just on screw the little caps on top of the battery and see how much fluid is in there if you can see the battery cells you need to put more acid and water depending how low it is but ask a parts store or call around to see what your mixture should be that's is acid and water and some times you can just put water just to top it off. good luck! Oh and another thing when you jump start your Vehicle and leave it running for 15 to 30 Min's.