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A quick step-by-step tutorial on how to replace the battery on a TAG Heuer Aquaracer. This watch belongs to a good friend, and it is in need of a battery replacement. Step 1: Remove the screw on case back. The tools I am using are a three-pins Jaxa case opener and a case holder. At first, I try to open the case-back just with the watch mounted on the case holder. But the case-back is very tightly screwed on (this is a diver watch with 300m waterproof). In the end, I secure the the case holder on a mounted bench vice to free both of my hands to open the case-back. I also find that using a three-pins opener a lot better than a two-pins, especially for a diver watch. Step 2: Check the battery The quartz movement inside this Aquaracer is a Ronda 6004.B, which uses 373 Silver-Oxide battery (or SR916SW). When I receive the watch, the battery is not fully exhausted. The small-second hand jumps every four seconds (battery-saving mode), though still keeping time it shows that the battery is weak. With battery replacement jobs, I usually receive the watch with a fully exhausted battery. To ensure that the issue is not with the movement, I always test the old battery before replacing it. A quick test on this battery shows that the problem is with the battery. A new battery is around 1.5Volts. Step 3: Grease the seals Before I screw the caseback on, I grease the caseback seal using Seiko silicon greaser (S-916) that comes with an applicator and the crown seal with Seiko greaser (TSF-451). If the seal is no longer in good condition, it is advisable to replace it also. Tip: To grease the seal on the crown, you will need to first remove the stem (or watch winder). Below is an excellent video on how to remove a stem on just about any watch. Step 4: Waterproof test The next step is to waterproof test the watch. Note: I am still saving up to get myself a waterproof tester. Job's done!