Watch Battery Replacement Tool Kit Perfect for your watch battery replacement. Now you can save money and do it youself. How to Change Your Watch Battery Make sure your watch case back is a screw off watch back This watch battery replacement tool kit is design for opening crew off watch back, you can tell the kind of watch back by looking at the back, if it has notches regularly placed on the case back that is an indication it is a screw off watch back. Fixed your watch You need to place the watch case in the watch holder to protect it and hold it steady during your work. Put your watch into the watch case holder (the yellow one).Then install the white posts, adjust the distance between the white ports and the black knob until it holds the watch case securely. Adjust the watch back remover You can use the screw control between the tips to make sure the watch back remover (the blue one) fits securely in the notches of the case back. Open the watch back remover's notches wider than the case of the watch. Then, with one tip in a notch, tighten the watch back remover until both tips fit snugly in the notches of the case back. Open the watch back case Grip the watch holder to keep it from moving and begin turning the watch back remover clockwise or counterclockwise to open the watch case. Do not force the watch back remover to move too quickly, it may slip and scratch the watch case. Choose the right watch battery There are 2pcs LR626GH watch batteries and 2pcs LR920G watch batteries in our package. They can fit most watches. If neither of these two kind of watch batteries are suitable for your watch, you need to buy a suitable watch battery.