205 BATTERY CHARGING Battery chargingPrior to using the transceiver for the first time, the battery pack mustbe fully charged for optimum life and operation.CAUTION: To avoid damage to the transceiver, turn it OFF whilecharging.• Recommended temperature range for charging:+10°C to +40°C (+50°F to +104°F)- The Li-Ion battery functions within –20°C to +60°C (–4°F to+140°F)• Use the specified chargers (BC-119N, BC-121N and BC-160).NEVER use another manufacturer’s charger.• Use the optional AC adapter. NEVER use another manufacturer’sAC adapter.Recommendation:Charge the supplied battery pack for a maximum of up to10 hours. Li-Ion batteries are different from Ni-Cd batteries inthat it is not necessary to completely charge and discharge themto prolong the battery life. Therefore, charging the battery in in-tervals, and not for extended periods is recommended.