How to change a coin-cell battery:
1. All you’ll need is a pair of needle-nosed pliers and a replacement battery.
2. Grasp the old battery with the tips of the pliers and slide it out.
3. Be careful not to let the metal clip holding the battery in place get bent outward. If that happens, you can bend it back into place while the battery is removed.
4. Slide the new battery into the battery holder, and enjoy your brighter light!