Page 258 - Lindens Handbook of Batteries

10.10 priMAry bATTerieS

1.9

1.7

1.5
Volts
1.3

1.1

0.9
750 mA 300 mA 160 mA 80 mA

0.1 1.0 10 100
Hours
(a)
1.9

1.7

1.5

Volts 1.3

1.1
250 mA 150 mA 75 mA 50 mA
0.9

0.1 1 5 10 50 60
Hours
(b)
FIGURE 10.12 Typical discharge curves of magnesium inside-out primary battery, D size.
(a) 20°C. (b) -20°C. (Courtesy of ACR Electronics, Inc.)

battery design must allow for the dissipation of this heat to prevent overheating, premature dry-out,
and shortened performance—or for using this heat to improve performance at low ambient tempera-
tures. in some low-temperature applications it is advantageous to insulate the battery against heat
loss. Actual discharge tests will be required to obtain precise performance data under a variety of
possible conditions and battery designs.
The battery and equipment design must also consider the hydrogen that is generated during dis-
charge. The hydrogen must be vented and kept from accumulating because hydrogen-air mixtures
are flammable above 4.1% hydrogen and explosive above 18% hydrogen.