Buteline have available an electric battery-operated clamp tool, complete with charger and spare battery, with separate jaws in 16mm, 22mm and 28mm.

The electric clamp tool is small and light - without jaws fitted, it's 415mm long and 1.9kg. This weight combined with a short pressing cycle makes the tool very easy to use with just one hand.
The tool can do approximately 100-150 clamps per charge, and is powered using a Makita 9.6V/2.0Ah Li-ion battery.
For more information, please contact us by freecalling 0800 043 8883 or contact your local Buteline representative.

Buteline Electric Clamp Tool with Bute Jaws

Electric clamp tools should be serviced every year or at every 20,000 clamps, whichever comes sooner. 
For servicing or repairs, please contact the below service agent in the United Kingdom: 

Klauke UK Ltd
Hillside Road East, Bungay, Suffolk, NR35 1JX, United Kingdom
P: +44 1986 891 513 (ask for Maurice Garrod)
F: +44 1986 896 132
E: mgarrod@klauke.textron.com

Service agents are also available in New Zealand and Australia