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10.6 priMAry bATTerieS
10.4 PERFORMANCE CHARACTERISTICS OF Mg/MnO BATTERIES
2
10.4.1 Discharge Performance
Typical discharge curves for the cylindrical magnesium/manganese dioxide primary battery are
shown in Fig. 10.5. The discharge profile is generally flatter than for the zinc-carbon batteries;
the magnesium battery also is less sensitive to changes in the discharge rate. The average discharge
voltage is on the order of 1.6 to 1.8 V, about 0.4 to 0.5 V above that of the zinc-carbon battery;
the typical end voltage is 1.2 V. The performance characteristics of the cylindrical magnesium
battery, type 1LM, on continuous and intermittent discharge are summarized in Figs. 10.6 to 10.8
and Table 10.2. The batteries were discharged under a constant-resistance load at 20°C.
Figure 10.6 provides a summary of the battery’s performance under continuous load to 1.1 V
end voltage.
2.0
1.8
Cell voltage, V 1.6
1.4
1.2
0.02 0.05 0.1 0.2 0.5 1.0 2 5 10 20 50 200 500
Hours of discharge
FIGURE 10.5 Typical discharge curves of magnesium/manganese dioxide cylindrical battery at 20°C.
FIGURE 10.6 1LM service life (hours to 1.1 V) vs. test load at
room temperature. (Courtesy of Rayovac Corporation.)
