117Appendixx Use an authorized battery and charger only.x Since overcharging may shorten battery life, remove the phone from its charger once it isfully charged. Unplug the charger, once charging is complete. Leaving the battery in hot orcold places, especially inside a car in summer or winter, may reduce the capacity and life ofthe battery. Always keep the battery within normal temperatures.x To prevent injury or burns, ensure that no metal objects come into contact with the + and –terminals of the battery.FCC Hearing-Aid Compatibility (HAC) Regulationsfor Wireless DevicesOn July 10, 2003, the U.S. Federal Communications Commission (FCC) Report and Orderin WT Docket 01-309 modified the exception of wireless phones under the Hearing AidCompatibility Act of 1988 (HAC Act) to require digital wireless phones be compatible withhearing-aids.The intent of the HAC Act is to ensure reasonable access to telecommunications services forpersons with hearing disabilities.While some wireless phones are used near some hearing devices (hearing aids and cochlearimplants), users may detect a buzzing, humming, or whining noise. Some hearing devicesare more immune than others to this interference noise, and phones also vary in the amountof interference they generate.The wireless telephone industry has developed a rating system for wireless phones, to assist hearing deviceusers find phones that may be compatible with their hearing devices. Not all phones have been rated.Phones that are rated have the rating on their box or a label located on the box.The ratings are not guarantees. Results will vary depending on the user’s hearing device and