<s>
A	O
battery	B-Algorithm
holder	I-Algorithm
is	O
one	O
or	O
more	O
compartments	O
or	O
chambers	O
for	O
holding	O
a	O
battery	O
.	O
</s>
<s>
For	O
dry	O
cells	O
,	O
the	O
holder	O
must	O
also	O
make	O
electrical	O
contact	O
with	O
the	O
battery	B-Algorithm
terminals	I-Algorithm
.	O
</s>
<s>
For	O
wet	O
cells	O
,	O
cables	O
are	O
often	O
connected	O
to	O
the	O
battery	B-Algorithm
terminals	I-Algorithm
,	O
as	O
is	O
found	O
in	O
automobiles	O
or	O
emergency	O
lighting	O
equipment	O
.	O
</s>
<s>
A	O
battery	B-Algorithm
holder	I-Algorithm
is	O
either	O
a	O
plastic	O
case	O
with	O
the	O
shape	O
of	O
the	O
housing	O
moulded	O
as	O
a	O
compartment	O
or	O
compartments	O
that	O
accepts	O
a	O
battery	O
or	O
batteries	O
,	O
or	O
a	O
separate	O
plastic	O
holder	O
that	O
is	O
mounted	O
with	O
screws	O
,	O
eyelets	O
,	O
glue	O
,	O
double-sided	O
tape	O
,	O
or	O
other	O
means	O
.	O
</s>
<s>
Battery	B-Algorithm
holders	I-Algorithm
may	O
have	O
a	O
lid	O
to	O
retain	O
and	O
protect	O
the	O
batteries	O
or	O
may	O
be	O
sealed	O
to	O
prevent	O
damage	O
to	O
circuitry	O
and	O
components	O
from	O
battery	O
leakage	O
.	O
</s>
<s>
Coiled	O
spring	O
wire	O
or	O
flat	O
tabs	O
that	O
press	O
against	O
the	O
battery	B-Algorithm
terminals	I-Algorithm
are	O
the	O
two	O
most	O
common	O
methods	O
of	O
making	O
the	O
electrical	O
connection	O
inside	O
a	O
holder	O
.	O
</s>
<s>
External	O
connections	O
on	O
battery	B-Algorithm
holders	I-Algorithm
are	O
usually	O
made	O
by	O
contacts	O
with	O
pins	O
,	O
surface	O
mount	O
feet	O
,	O
solder	O
lugs	O
,	O
or	O
wire	O
leads	O
.	O
</s>
<s>
Where	O
the	O
battery	O
is	O
expected	O
to	O
last	O
over	O
the	O
life	O
of	O
the	O
product	O
,	O
no	O
holder	O
is	O
necessary	O
,	O
and	O
a	O
tab	O
welded	O
to	O
the	O
battery	B-Algorithm
terminals	I-Algorithm
can	O
be	O
directly	O
soldered	O
to	O
a	O
printed	O
circuit	O
board	O
.	O
</s>
<s>
617592	O
dated	O
March	O
1898	O
is	O
for	O
an	O
early	O
metal	O
flashlight	O
that	O
accepted	O
D	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
Some	O
early	O
1900s	O
battery	B-Algorithm
holders	I-Algorithm
were	O
often	O
no	O
more	O
than	O
a	O
cardboard	O
box	O
with	O
copper	O
contacts	O
.	O
</s>
<s>
By	O
the	O
1920s	O
,	O
battery	B-Algorithm
holders	I-Algorithm
used	O
twin	O
metal	O
clips	O
(	O
like	O
fuse	O
holders	O
)	O
to	O
hold	O
the	O
battery	O
in	O
place	O
while	O
making	O
electrical	O
contact	O
.	O
</s>
<s>
The	O
introduction	O
of	O
polypropylene	O
in	O
the	O
1950s	O
and	O
miniature	O
batteries	O
by	O
Eveready	O
allowed	O
for	O
the	O
use	O
of	O
small	O
plastic	O
battery	B-Algorithm
holders	I-Algorithm
.	O
</s>
<s>
Battery	B-Algorithm
holders	I-Algorithm
developed	O
in	O
parallel	O
with	O
batteries	O
over	O
time	O
;	O
as	O
battery-package	O
sizes	O
shrunk	O
so	O
did	O
the	O
holders	O
.	O
</s>
<s>
In	O
the	O
1980s	O
,	O
the	O
first	O
circuit	O
board	O
mounting	O
lithium	O
coin	B-Algorithm
or	I-Algorithm
button	I-Algorithm
cell	I-Algorithm
battery	I-Algorithm
holders	O
appeared	O
in	O
the	O
form	O
of	O
patent	O
no	O
.	O
</s>
<s>
4487820	O
by	O
the	O
battery	B-Algorithm
holder	I-Algorithm
manufacturer	O
MPD	O
.	O
</s>
<s>
The	O
electronics	O
industry	O
now	O
uses	O
many	O
surface-mounted	O
lithium	O
battery	B-Algorithm
holders	I-Algorithm
or	O
sockets	O
.	O
</s>
<s>
CR2/3A	O
,	O
CR1/2AA	O
,	O
and	O
CR123A	B-Library
batteries	I-Library
began	O
in	O
camera	O
applications	O
but	O
expanded	O
into	O
new	O
markets	O
like	O
alarm	O
systems	O
,	O
hand	O
held	O
computers	O
and	O
keyfobs	O
.	O
</s>
<s>
Design	O
of	O
the	O
battery	B-Algorithm
holder	I-Algorithm
requires	O
knowledge	O
of	O
how	O
and	O
where	O
the	O
larger	O
product	O
will	O
be	O
used	O
.	O
</s>
<s>
A	O
designer	O
must	O
select	O
between	O
a	O
battery	B-Algorithm
holder	I-Algorithm
molded	O
into	O
the	O
product	O
case	O
or	O
made	O
as	O
a	O
separate	O
part	O
.	O
</s>
<s>
For	O
many	O
products	O
regulations	O
and	O
product	O
safety	O
standards	O
affect	O
the	O
battery	B-Algorithm
holder	I-Algorithm
selection	O
.	O
</s>
<s>
Most	O
current	O
battery	B-Algorithm
holders	I-Algorithm
are	O
made	O
with	O
polypropylene	O
or	O
nylon	O
bodies	O
rated	O
for	O
.	O
</s>
<s>
Lithium	O
coin	B-Algorithm
cell	I-Algorithm
holders	O
are	O
made	O
with	O
high	O
temperature	O
PBT	O
,	O
nylon	O
or	O
LCP	O
bodies	O
because	O
they	O
normally	O
are	O
circuit	O
board	O
mounted	O
and	O
require	O
wave	O
soldering	O
at	O
or	O
reflow	O
soldering	O
at	O
.	O
</s>
<s>
The	O
contact	O
for	O
the	O
anode	O
side	O
can	O
be	O
recessed	O
behind	O
plastic	O
and	O
receive	O
a	O
battery	O
nub	O
common	O
on	O
alkaline	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
In	O
July	O
2010	O
,	O
Microsoft	O
said	O
it	O
hoped	O
to	O
sell	O
its	O
InstaLoad	B-Algorithm
polarity	O
protection	O
technology	O
,	O
which	O
allows	O
batteries	O
to	O
be	O
inserted	O
in	O
either	O
orientation	O
and	O
still	O
operate	O
properly	O
.	O
</s>
<s>
Battery	B-Algorithm
holders	I-Algorithm
for	O
zinc-air	B-Algorithm
batteries	I-Algorithm
must	O
not	O
be	O
completely	O
air-tight	O
since	O
approximately	O
1	O
litre	O
of	O
air	O
is	O
required	O
per	O
ampere-hour	O
of	O
discharge	O
per	O
cell	O
.	O
</s>
<s>
The	O
battery	B-Algorithm
holder	I-Algorithm
may	O
include	O
a	O
valve	O
integrated	O
with	O
the	O
device	O
power	O
switch	O
to	O
allow	O
air	O
to	O
be	O
admitted	O
when	O
the	O
device	O
is	O
switched	O
on	O
.	O
</s>
