Hi, check the batter level and then try re-synching the remote's.
Here's instructions for both:
A fresh set of alkaline batteries should last, depending on amount and type of use, up to 35 hours. This can vary greatly based on certain factors, such as Wii Remote Speaker Volume, Rumble, battery quality and age, and type of game being played.
Important Note: If you are using rechargeable batteries, the only type of battery recommended are Nickel Metal Hydride batteries. When it comes to using rechargeable batteries, you must follow manufacturer guidelines for safety and proper usage. Failure to do so could cause damage to the Wii Remote and void the warranty.
There are two ways to check the Wii Remote's battery levels:
- Remove the battery cover and press the Red "Sync" button. The number of lights flashing indicates the Wii Remote's battery strength. Four flashing lights indicates full strength, with one light flashing indicating the lowest level.
- Use the HOME Menu to check battery level of each Wii Remote:
- Press the HOME Button on a Wii Remote that is synchronized with the Wii console.
- Select the Wii Remote Settings option from the Home Menu.
- The battery level of all synced Wii Remotes is displayed along the bottom. Four bars indicates a full charge, with one being the lowest charge.
Make sure you have placed batteries in the Wii Remote.
- Press the Power button on the Wii console to turn it on.
- Remove the battery cover on the back of the Wii Remote you wish to sync up, and press the SYNC button just below the batteries. The Player LED will blink.
- Open the SD Card Slot cover on the front of the Wii console and press the SYNC button on the inside of the compartment.
- When the Player LED blinking stops, the syncing is complete. The LED that is illuminated indicates the player number (1 to 4).
This procedure must be followed for each additional Wii Remote added to your system.
I hope this helps