CAUTION: There are no user serviceable components inside the AEROCET 531. Do not attempt to change the internal battery pack. The wrong battery pack could cause serious damage or a fire. Only a factory qualified person should change and properly dispose of the battery pack.
When the internal battery pack output goes below 5.80 volts DC, a low battery message (Low Battery!) is displayed on the main sample screen. If the output goes below 5.50 volts the charge battery warning Charge battery! is displayed on the screen (refer to section 5.10).
To charge the battery pack, connect the AC power cord from the AC to DC converter module to an AC power outlet. The module is universal and will work with power line voltages of 100 to 240 volts, 50 to 60 Hz. Take the plug on the end of the cord coming from the converter module and plug it into the charger input socket on the side of the AEROCET 531 just below the power switch. Completely charging a discharged battery pack may take up to 15 hours.
The battery pack inside the AEROCET 531 when fully charged will power the AEROCET 531 for about five hours of continuous use. Under normal intermittent or manual operation however, the battery should last for about 8 hours.
If the AEROCET 531 is used on a daily basis, connect the charger at the end of each day. The battery pack will not be damaged if left connected to the charger over long periods.
If the AEROCET 531 is used in an area where AC power is available it is recommended to leave the charger connected to the AEROCET 531. If the AEROCET 531 is to be stored charge the battery pack. Storing a discharged NiMH battery for any length of time will degrade its performance