143BATTERY PACKS‘‘ Charging NOTEPrior to using the transceiver for the first time, the battery pack mustbe fully charged for optimum life and operation.• Recommended temperature range for charging:+10°C to +40°C (50°F to 140°F).• Use the supplied charger or optional charger (BC-144/BC-121 forrapid charging, BC-146 for regular charging) only. NEVER use othermanufacturers’ chargers.The optional BP-222, BP-209 or BP-210 battery packs includerechargeable Ni-Cd (Ni-MH: BP-210) batteries and can be chargedapprox. 300 times. Charge the battery pack before first operatingthe transceiver or when the battery pack becomes exhausted.If you want to charge the battery pack more than 300 times, the fol-lowing points should be observed:• Avoid over charging. The charging period should be less than24 hours.• Use the battery until it becomes almost completely exhausted undernormal conditions. We recommend battery charging after transmittingbecomes impossible.DD Battery pack lifeWhen the operating period becomes extremely short even aftercharging the battery pack fully, a new battery pack is needed.