a batten is a long strip of wood that is fixed to something to strengthen it or to hold it firm.
A batten is most commonly a strip of solid material, historically wood but can also be of plastic, metal, or fiberglass. Battens are variously used in construction, sailing, and other fields. In the lighting industry, battens refer to linear light fittings. In the steel industry, battens used as furring may also be referred to as top hats, in reference to the profile of the metal.
Batten disease is a fatal disease of the nervous system that typically begins in childhood. It is the common name for a group of disorders called the neuronal ceroid lipofuscinoses (ncls).
Batten | Definition of Batten by Merriam Webster
It is important to check the quality of other battens on the market to ensure you are roofing to current british standards. The below graded batten checklist will help you decide if your current roofing batten is up to standard.