User manual LA CROSSE TECHNOLOGY RS250

[. . . ] Never use other kinds of the power cable and transformer apart from those originally supplied with the charging unit. The rechargeable battery may become hot during charging. User should take extra care when taking out the battery after charging. Unplug the charging unit from the power source when it is not in use. FEATURES: The Charging unit Charging the rechargeable battery in around 250mA charging current Individual LCD display for different compartments Charging both "AA" and "AAA" rechargeable batteries simultaneously Minus delta voltage (-dV) detection for charge termination Defect batteries detection The charging function can be launched independently and 17 simultaneously to each rechargeable battery in the compartments The display of terminal voltage (in V) and percentage (in %) will alternate during charging Trickle charging is available after the rechargeable battery is fully charged To prevent overcharge, charger timer is available to limit the charging time to 18 hours for each newly installed battery INVENTORY OF CONTENTS 1. [. . . ] If the defect batteries are placed to the charging unit, the "DEF" sign (figure 2) will show on the LCD of charger. The "DEF" sign will flash for a while on the LCD when the charger detects the battery condition. When the defective condition of the battery is confirmed, the "DEF" sign will turn on permanently. "--" displays - No battery is placed to the charging unit (figure 1) 20 "DEF" displays ­ A defect battery is placed into the charging unit (figure 2) If attempting to recharge the alkaline or carbon batteries, it may cause rupture, explosion or the leakage of hazardous liquids. During the charging process, the "Charge" sign will show if any rechargeable batteries are placed into the unit. Users should make sure that the charged batteries are either NiCd or NiMH type and should not use the alkaline or carbon batteries. Carbon or Alkaline batteries may be the cause of the defect. Those types of batteries are NOT suitable for this charger. Another defect cause may come from the rechargeable batteries which voltage is too low. TRICKLE CHARGING After the rechargeable battery is fully charged, the charger will give a small amount of current to the rechargeable batteries to maintain the fully charged level. This stage is automatically launched after rechargeable batteries are fully charged and kept at the charging unit. The "Full" sign will display on the LCD. 21 START CHARGING THE RECHARGEABLE BATTERIES After the transformer has been plugged to the power source, user should insert a rechargeable battery into the charging unit and plug the DC jack into the battery charger. Shortly afterwards, the battery voltage (for example, "1. 38V") will display. Then the "Charge" sign will show on LCD within 5 seconds, indicating that the charging process with around 250mA is going to start. During charging, terminal voltage (in V) (figure 3) and percentage (in %) (figure 4) are the two items that will alternate to show on the LCD. Indication of battery charging Terminal voltage (Figure 3) 22 Indication of battery charging Percentage (Figure 4) After the rechargeable battery is fully charged, "Full" sign (figure 5) will show on the display and the user may take them out at this time. Or if the rechargeable batteries are kept placing at the compartments, trickle charging will start. The trickle charging current is around 10% duty cycle of the charging current to keep the rechargeable batteries full. (Figure 5) "Full" sign shows -The battery is fully charged Note : The charging current of the rechargeable batteries depends on battery condition. In case the power source terminates, the charger will reset. Once the power source is back to normal, the batteries will be taken as newly installed batteries in the charger. 23 For proper reset, unplug the DC jack and wait for 5 seconds before plugging it into the charger. CARE AND MAINTENANCE: Extreme temperatures, vibration and shock should be avoided as these may cause the damage to the unit When cleaning the displays and casings, use a soft damp cloth only. Do not wet the exposed metal part of the charging unit. Do not use solvents or scouring agents as they may mark the LCD and casing. [. . . ] Do not store or use it near an extreme heat. Do not use any accessory not supplied with the charger. The user should never use any power cable and transformer other than those originally supplied with the charging unit. Disconnect the AC/DC adapter when the unit is not in use. [. . . ]