Battery Level IndicatorThe satellite status page also features a battery level indicator, located to the left of thesky view, which displays the strength of the unit’s batteries (Fig. 24).The battery level indicator is calibrated for alkaline batteries. Ni-Cad and lithiumbatteries will inaccurately display the battery level at one-half its proper leveldue to voltage differences. No other receiver functions are affected by using Ni-Cad or lithium batteries.The GPS II features an internal lithium battery that will maintain the unit’s memoryfor up to 10 years, regardless of whether the four AA batteries are installed.REFERENCE24Fig. 24#!