<s>
A	O
photoflash	B-Algorithm
battery	I-Algorithm
is	O
a	O
specialized	O
zinc-carbon	B-Algorithm
battery	I-Algorithm
optimized	O
to	O
provide	O
a	O
high	O
electric	O
current	O
output	O
for	O
a	O
very	O
short	O
time	O
,	O
such	O
as	O
required	O
to	O
fire	O
a	O
flashbulb	O
.	O
</s>
<s>
Photoflash	O
cells	O
were	O
in	O
production	O
during	O
the	O
flashbulb	O
era	O
,	O
and	O
were	O
phased	O
out	O
as	O
alkaline	B-Algorithm
cells	I-Algorithm
came	O
into	O
general	O
use	O
,	O
and	O
one-use	O
flashbulbs	O
were	O
replaced	O
by	O
electronic	O
flash	O
.	O
</s>
<s>
The	O
photoflash	O
cell	O
was	O
produced	O
in	O
1.5	O
volt	O
D	B-Algorithm
,	O
C	O
,	O
and	O
AA	O
size	O
.	O
</s>
<s>
The	O
cathode	O
of	O
a	O
zinc-carbon	B-Algorithm
cell	I-Algorithm
is	O
usually	O
made	O
of	O
powdered	O
carbon	O
black	O
(	O
or	O
acetylene	B-Language
black	I-Language
)	O
,	O
manganese	O
dioxide	O
and	O
electrolyte	O
.	O
</s>
<s>
The	O
MnO2	O
to	O
carbon	O
ratio	O
varies	O
between	O
10:1	O
and	O
3:1	O
for	O
general	O
purpose	O
cells	O
,	O
but	O
a	O
1:1	O
mixture	O
is	O
used	O
for	O
photoflash	B-Algorithm
batteries	I-Algorithm
,	O
allowing	O
a	O
high	O
current	O
output	O
with	O
intermittent	O
use	O
,	O
as	O
required	O
for	O
photoflash	O
use	O
.	O
</s>
<s>
Another	O
common	O
type	O
of	O
photoflash	B-Algorithm
battery	I-Algorithm
is	O
a	O
series	O
assembly	O
of	O
cells	O
,	O
often	O
providing	O
22.5	O
volts	O
,	O
used	O
in	O
battery	O
–	O
capacitor	O
flash	O
units	O
.	O
</s>
<s>
Higher-voltage	O
photoflash	B-Algorithm
batteries	I-Algorithm
were	O
also	O
made	O
to	O
fire	O
reusable	O
xenon	O
electronic	O
flash	O
tubes	O
,	O
which	O
require	O
a	O
high	O
voltage	O
,	O
without	O
the	O
use	O
of	O
circuitry	O
generating	O
this	O
voltage	O
from	O
low-voltage	O
batteries	O
.	O
</s>
