79Warnings and precautionsonly Acer approved batteries, and recharge your battery onlywith Acer approved chargers designated for this device.Unplug the charger from the electrical plug and the devicewhen not in use. Do not leave a fully charged batteryconnected to the AC adapter, since overcharging may shortenits lifetime. If left unused, a fully charged battery will lose itscharge over time. If the battery is completely discharged, itmay take a few minutes before the charging indicator appearson the display or before any calls can be made.Use the battery only for its intended purpose. Never use anycharger or battery that is damaged.Do not short-circuit the battery. Accidental short-circuiting canoccur when a metallic object such as a coin, clip, or pen causesdirect connection of the positive (+) and negative (-) terminalsof the battery. (These look like metal strips on the battery.)This might happen, for example, when you carry a sparebattery in your pocket or purse. Short-circuiting the terminalsmay damage the battery or the connecting object.Leaving the battery in hot or cold places, such as in a closed carin summer or winter conditions, will reduce the capacity andlifetime of the battery. Always try to keep the battery between15 °C and 25 °C (59 °F and 77 °F). A device with a hot or coldbattery may not work temporarily, even when the battery isfully charged. Battery performance is particularly limited intemperatures well below freezing.Do not dispose of batteries in a fire as they may explode.Batteries may also explode if damaged. Dispose of batteriesaccording to local regulations. Please recycle when possible.Do not dispose as household waste.