52Maintaining your phone’s peak performance.To operate your phone properly – that is, to maintain safe andsatisfactory service – you should follow these rules:˛ For best reception, extend the antenna fully.˛ Hold the phone with the antenna up and over your shoulder.˛ Do not hold the phone antenna at any time.˛ Do not use the phone with a damaged antenna.˛ Speak directly into the mouthpiece.Avoid exposing your phone and accessories to rain or liquidspills. If your phone does get wet, turn the power off immediatelyand remove the battery pack. If it is inoperable, you shouldreturn it to a Sprint PCS Center or call Sprint PCS Customer Carefor service.Allow only authorized personnel to service your phone and itsaccessories. Faulty service may invalidate the warranty.Protecting your battery.For best battery performance, you should follow these guidelines:˛ Only use Samsung-approved batteries (model numbersCSB-1900 and CEB-1900) and cigarette lighter adapter, desk-top and travel chargers (model numbers CCL-1900, CDT-1900and CTC-1900). These chargers are designed to maximizebattery life. Using other batteries or chargers may invalidateyour warranty and may cause damage as well.˛ To avoid damage, charge the battery only in temperatures thatrange from 32°F to 104°F (0°C to 40°C).˛ Do not use the battery charger in direct sunlight or in highhumidity areas, such as the bathroom.˛ Never dispose of the battery by incineration.˛ Keep the metal contacts at the top of the battery clean.˛ Do not attempt to disassemble or short-circuit the battery.˛ You may need to recharge the battery if it has not been usedfor a long period of time.˛ Condition your battery once a month.53