Page 228 - Lindens Handbook of Batteries

9.22 PRIMARY BATTERIES

FIGURE 9.17 Zinc-carbon batteries, continuous discharge through 3.9 ohm at 20°C.

for the high-rate drain, illustrating the advantage of the lower current density discharge for the
larger batteries. The high discharge rate for the general-purpose C- and D-size batteries at 300 mA
(3.9 ohms) is shown in Fig. 9.17 compared with the performance of the general-purpose larger
No. 6 battery, for which this discharge rate is low.

9.6.5 Comparative Discharge Curves: Different Battery Grades
Figure 9.18 compares both Leclanché and zinc chloride general-purpose (GP), heavy-duty (HD),
and the extra/super heavy-duty (EHD) D-size batteries (as defined in Sec. 9.3) discharged continu-
ously through a 2.2 ohm load at 20°C. A performance ratio, to the 0.9 V cutoff, of 1.0:1.3 between
the Leclanché and zinc chloride GP batteries was observed. The same ratio for the HD batteries was

FIGURE 8.18 Comparison of Leclanché and zinc chloride D-size batteries of various grades, continuously
discharged through 2.2 ohm at 20°C. GP: General purpose; HD: Heavy duty; EHD: Extra heavy duty.