You might not use a cement mixer often, but it's very handy to have your own once the need arises. There's no cord to restrict you, just make sure you've charged the battery.
From Data Powertools
Makita UT001GZ02 40Vmax XGT Brushless Mixing Paddle Body Only
ITS
Makita UT001GZ02 40V XGT Brushless Mixer - Body