You will need:
A flat blade
A new CR2450 battery
A small Phillips head screwdriver
Step 1. Remove the sticker
Use a flat blade to lift up a corner of the sticker.
Peel it off and set it aside carefully, sticky side up, so that it can be re-used.
Step 2. Remove the four screws
Step 3. Remove circuit board
Carefully take out the circuit board. Try not to touch any components.
Step 4. Replace the battery
Slide the old battery out of the slot. It may help to carefully push it from the other side with the screwdriver.
Pay attention to which way up it should be.
Dispose of the old battery thoughtfully.
Pop the new battery into the slot.
Step 5. Replace circuit board
Place the board back into the casing.
It only goes in one way. Do not force it.
Step 6. Close the casing
Close the casing and replace the screws.
Step 7. Replace the sticker
If the sticker is damaged, call us and we can send you a replacement.