If your Stanley Jumpit 1000 jump starter is not holding a charge, the first thing to do is to check the connection between the battery and the charger. Make sure everything is plugged in correctly and that there are no loose wires or connections. If this doesn't solve the problem, it may be necessary to replace the battery entirely. If you find that the battery still doesn't charge, it's possible that other parts of the jump starter may be faulty and need to be replaced.