337 BATTERY CASE Optional battery case (BP-240)When using the optional battery case, install 6 × AAA (LR03) sizealkaline batteries as illustrated at right.q Unhook the battery cover release hook (q), and open the coverin the direction of the arrow (w). (Fig.1)w Then, install 6 × AAA (LR03) size alkaline batteries. (Fig.2)• Install the alkaline batteries only.• Be sure to observe the correct polarity.• Do not pin the ribbon under the batteries.e Fit the cover in the direction of the arrow (e), then close (r).Hook the battery cover release hook until it makes a ‘click’ sound(t). (Fig.3)CAUTION:• When installing batteries, make sure they are all the samebrand, type and capacity. Also, do not mix new and old batter-ies together.• Keep battery contacts clean. It’s a good idea to clean batteryterminals once a week.• Never incinerate used battery cells since internal battery gasmay cause them to rupture.• Never expose a detached battery case to water. If the batterycase gets wet, be sure to wipe it dry before using it.NOTE: When the optional battery case is attached, the batterytype must be selected to “Alkaline battery operation” when turn-ing the transceiver ON. (p. 12)