You will need a new battery.  This remote works perfectly as designed.

Take control of your ceiling fan with this Hunter remote control, designed for easy and convenient use. The white color and sleek finish make it a stylish addition to any indoor space. Powered by batteries, this remote control is perfect for those who want to add a touch of modern technology to their home decor.

With three speeds and a voltage of 12V, this remote control is compatible with a variety of ceiling fan models. It is easy to install and comes with one remote control per order. Upgrade your ceiling fan control with this Hunter remote control today.