Lighter fluid has quite a few uses other than in a cigarette lighter. I have "brought back to life" numerous quartz watches with it. If after placing a new battery, which you have tested, into the watch it still does not work, remove the battery and gently clean the movement, including the battery-well and contact points, with a Q-Tip soaked in lighter fluid. The fluid will evaporate very quickly. Replace the battery and the case back. It doesn't always work; however, I've been lucky maybe 6 or 7 times out of ten.