What further features and functions should I look out for on cordless/battery powered grass trimmers?

•  Tap and Go’ or ‘bump head’ style line feed so you don’t have to bend

•  Folding mechanisms for compact storage

•  Safety switch

•  Loop or ‘D’ shaped handle on shaft for more comfort and better control

•  Articulated or adjusting handle

•  Tilting head for flexibility

•  Plant protector

•  Telescopic shaft for storage and cutting flexibility

•  Shoulder harness for extra comfort

•  Soft grip handle for comfort and to reduce effect of vibration

•  Attachable wheels for easier handling 

•  Waist holster/harness to hold batteries

•  Innovative plastic blade system

•  Storage on handle/shaft