Definitions for "Maintained"
class of emergency lighting fitting which is constantly illuminated. When the mains supply fails power to the lamp is provided by a rechargeable battery. During mains operation battery condition is maintained by trickle charging from the mains supply. In the UK a minimum of 3 hours operation from the battery is required. See also non-maintained
continued in your keeping or use or memory; "in...the retained pattern of dancers and guests remembered"
Keywords:  ready, service
made ready for service
Keywords:  good, condition
kept in good condition