9.1 The source of energy should be a primary battery
integrated in the equipment and may be replaceable by the user. In
addition, provision may be made to operate the equipment using an
external source of electrical energy.
9.2 The primary battery should have sufficient
capacity to ensure 8-hour operation at its highest rated power with
a duty cycle of 1:9. This duty cycle is defined as 6-second transmission,
6-second reception above squelch opening level and 48-second reception
below squelch opening level.
9.3 Primary batteries should have a shelf life
of at least 2 years.