From Amazon
Einhell Power X-Change Cordless Paint & Plaster Mixer - 18V Electric Mixing Paddle for Paint, Plaster, Cement, Concrete and Mortar - TP-MX 18-2 Li Brushless Ø120 mm Stirrer (Battery Not Included)
Wickes
Einhell Power X-Change 18V Cordless Brushess Paddle Mixer - Bare