IMPORTANT SAFETY NOTE: Ensure that after changing the batteries you secure the battery cover with the screw supplied. This is especially important if children may have access to the keypads.
You will need 2 x CR2032 per keypad and a Phillips size 0 screwdriver.
Each keypad has a removable battery cover which is secured in place with a screw.
You will need a Phillips size 0 screwdriver to remove it. Please ensure that you have the correct screwdriver to avoid wearing away the thread which will mean you cannot access the battery compartment.
Be careful when removing the covers as the keypads number sticker is on the cover, so you must ensure that you can match the covers with their original keypad once you have replaced the batteries.
Remove the cells and put a little tape around each one. This prevents them getting warm when in contact with each other. Do not put the cells in the bin. Check online to find where you can safely dispose of them.
Put the new cells in with the flat side facing up.
Replace the battery cover and secure it with the screw provided. This step is very important. There are delicate contacts for the batteries. Those could get broken if the compartment is not secured. More importantly, the cells themselves can be dangerous, especially to children and animals. The note below explains about the risks.
The risks posed by button and coin batteries
Button and coin batteries can pose a severe health risk, particularly to children and pets, if inserted, swallowed or ingested. Although a child may not choke if they swallow a button or coin battery, the batteries can do serious internal damage. While any coin or button battery can pose a serious risk, coin batteries pose the most risk due to their larger size, which is typically greater or equal to 16mm in diameter. These batteries can react with saliva if lodged in the throat to create caustic soda, a chemical often used to unblock drains. This chemical reaction can burn and lead to internal bleeding, and possibly death. If a battery gets into the stomach, it can cause significant tissue damage.
There have been several recent child fatalities in the UK as a result of button or coin battery ingestion, including a two-year-old girl who died in May 2021 after swallowing batteries from a remote control. According to the Child Accident Prevention Trust, at least two children a year die as a result of swallowing lithium batteries in the UK.
Souce: https://www.gov.uk/guidance/using-button-and-coin-batteries#:~:text=This%20guidance%20is%20for