<s>
The	O
AA	B-Algorithm
battery	I-Algorithm
(	O
or	O
double-A	B-Algorithm
battery	I-Algorithm
)	O
is	O
a	O
standard	O
size	O
single	O
cell	O
cylindrical	O
dry	B-Algorithm
battery	I-Algorithm
.	O
</s>
<s>
The	O
IEC	B-Algorithm
60086	I-Algorithm
system	O
calls	O
the	O
size	O
R6	O
,	O
and	O
ANSI	O
C18	O
calls	O
it	O
15	O
.	O
</s>
<s>
AA	B-Algorithm
batteries	I-Algorithm
are	O
common	O
in	O
portable	O
electronic	O
devices	O
.	O
</s>
<s>
An	O
AA	B-Algorithm
battery	I-Algorithm
is	O
composed	O
of	O
a	O
single	O
electrochemical	O
cell	O
that	O
may	O
be	O
either	O
a	O
primary	O
battery	O
(	O
disposable	O
)	O
or	O
a	O
rechargeable	B-Architecture
battery	I-Architecture
.	O
</s>
<s>
The	O
exact	O
terminal	B-Algorithm
voltage	O
,	O
capacity	O
and	O
practical	O
discharge	O
rates	O
depend	O
on	O
cell	O
chemistry	B-Algorithm
;	O
however	O
,	O
devices	O
designed	O
for	O
AA	B-Algorithm
cells	I-Algorithm
will	O
usually	O
only	O
take	O
1.2	O
–	O
1.5	O
Vunless	O
specified	O
by	O
the	O
manufacturer	O
.	O
</s>
<s>
Introduced	O
in	O
1907	O
by	O
The	O
American	O
Ever	O
Ready	O
Company	O
,	O
the	O
AA	B-Algorithm
battery	I-Algorithm
size	O
was	O
standardized	O
by	O
the	O
American	O
National	O
Standards	O
Institute	O
(	O
ANSI	O
)	O
in	O
1947	O
,	O
but	O
it	O
had	O
been	O
in	O
use	O
in	O
flashlights	O
and	O
electrical	O
novelties	O
before	O
formal	O
standardization	O
.	O
</s>
<s>
ANSI	O
and	O
IEC	O
battery	B-Algorithm
nomenclature	I-Algorithm
gives	O
several	O
designations	O
for	O
cells	O
in	O
this	O
size	O
,	O
depending	O
on	O
cell	O
features	O
and	O
chemistry	B-Algorithm
.	O
</s>
<s>
An	O
AA	B-Algorithm
cell	I-Algorithm
measures	O
in	O
length	O
,	O
including	O
the	O
button	O
terminal	B-Algorithm
—	O
and	O
in	O
diameter	O
.	O
</s>
<s>
The	O
positive	O
terminal	B-Algorithm
button	O
should	O
be	O
a	O
minimum	O
1mm	O
high	O
and	O
a	O
maximum	O
5.5mm	O
in	O
diameter	O
,	O
the	O
flat	O
negative	O
terminal	B-Algorithm
should	O
be	O
a	O
minimum	O
diameter	O
of	O
7mm	O
.	O
</s>
<s>
Alkaline	B-Algorithm
AA	B-Algorithm
cells	I-Algorithm
have	O
a	O
weight	O
of	O
roughly	O
,	O
lithium	O
AA	B-Algorithm
cells	I-Algorithm
around	O
,	O
and	O
rechargeable	B-Architecture
Ni-MH	B-Device
cells	O
around	O
.	O
</s>
<s>
Primary	O
(	O
non-rechargeable	O
)	O
zinc	B-Algorithm
–	I-Algorithm
carbon	I-Algorithm
(	O
dry	B-Algorithm
cell	I-Algorithm
)	O
AA	B-Algorithm
batteries	I-Algorithm
have	O
around	O
400	O
–	O
900	O
milliampere	O
hours	O
capacity	O
,	O
with	O
measured	O
capacity	O
highly	O
dependent	O
on	O
test	O
conditions	O
,	O
duty	O
cycle	O
,	O
and	O
cut-off	O
voltage	O
.	O
</s>
<s>
Zinc	B-Algorithm
–	I-Algorithm
carbon	I-Algorithm
batteries	I-Algorithm
are	O
usually	O
marketed	O
as	O
"	O
general	O
purpose	O
"	O
batteries	O
.	O
</s>
<s>
Alkaline	B-Algorithm
batteries	I-Algorithm
from	O
1,700	O
mAh	O
to	O
2,850	O
mAh	O
cost	O
more	O
than	O
zinc-chloride	O
batteries	O
,	O
but	O
hold	O
additional	O
charge	O
.	O
</s>
<s>
AA	B-Algorithm
size	O
alkaline	B-Algorithm
batteries	I-Algorithm
are	O
termed	O
as	O
LR06	B-Algorithm
by	O
IEC	O
,	O
and	O
AM-3	O
by	O
JIS	O
.	O
</s>
<s>
Non-rechargeable	O
lithium	B-Device
iron	I-Device
disulfide	I-Device
batteries	I-Device
are	O
manufactured	O
for	O
devices	O
that	O
draw	O
more	O
current	O
,	O
such	O
as	O
digital	B-Device
cameras	I-Device
,	O
where	O
their	O
high	O
cost	O
is	O
offset	O
by	O
longer	O
running	O
time	O
between	O
battery	O
changes	O
and	O
more	O
constant	O
voltage	O
during	O
discharge	O
.	O
</s>
<s>
The	O
capacity	O
of	O
alkaline	B-Algorithm
batteries	I-Algorithm
is	O
greatly	O
reduced	O
as	O
the	O
discharge	O
current	O
increases	O
,	O
however	O
the	O
capacity	O
of	O
a	O
Li-FeS2	O
battery	O
is	O
not	O
affected	O
by	O
high	O
discharge	O
currents	O
nearly	O
as	O
much	O
as	O
alkaline	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
Another	O
advantage	O
of	O
lithium	O
disulfide	O
batteries	O
compared	O
to	O
alkaline	B-Algorithm
batteries	I-Algorithm
is	O
that	O
they	O
are	O
less	O
prone	O
to	O
leak	O
.	O
</s>
<s>
This	O
is	O
particularly	O
important	O
in	O
expensive	O
equipment	O
,	O
where	O
a	O
leaking	O
alkaline	B-Algorithm
battery	I-Algorithm
can	O
damage	O
the	O
equipment	O
due	O
to	O
the	O
corrosive	O
electrolyte	O
coming	O
into	O
contact	O
with	O
sensitive	O
electronics	O
.	O
</s>
<s>
Lithium	B-Device
iron	I-Device
disulfide	I-Device
batteries	I-Device
are	O
intended	O
for	O
use	O
in	O
equipment	O
compatible	O
with	O
alkaline	B-Algorithm
zinc	B-Algorithm
batteries	I-Algorithm
.	O
</s>
<s>
Lithium-iron	O
disulfide	O
batteries	O
can	O
have	O
an	O
open-circuit	O
voltage	O
as	O
high	O
as	O
1.8	O
volts	O
,	O
but	O
the	O
closed-circuit	O
voltage	O
decreases	O
,	O
making	O
this	O
chemistry	B-Algorithm
compatible	O
with	O
equipment	O
intended	O
for	O
zinc-based	O
batteries	O
.	O
</s>
<s>
A	O
fresh	O
alkaline	B-Algorithm
zinc	B-Algorithm
battery	I-Algorithm
can	O
have	O
an	O
open-circuit	O
voltage	O
of	O
1.6	O
volts	O
,	O
but	O
a	O
lithium	O
iron	O
disulfide	O
battery	O
with	O
an	O
open-circuit	O
voltage	O
below	O
1.7	O
volts	O
is	O
entirely	O
discharged	O
.	O
</s>
<s>
Rechargeable	B-Architecture
batteries	I-Architecture
in	O
the	O
AA	B-Algorithm
size	O
are	O
available	O
in	O
multiple	O
chemistries	O
:	O
</s>
<s>
nickel	O
–	O
cadmium	O
(	O
NiCd	O
)	O
with	O
a	O
capacity	O
of	O
roughly	O
600	O
–	O
1,000	O
mAh	O
,	O
nickel	B-Device
–	I-Device
metal	I-Device
hydride	I-Device
(	O
NiMH	B-Device
)	O
in	O
various	O
capacities	O
of	O
600	O
–	O
2,750	O
mAh	O
and	O
lithium-ion	O
.	O
</s>
<s>
NiCd	O
and	O
NIMH	B-Device
provide	O
1.2V	O
;	O
lithium-ion	O
chemistry	B-Algorithm
has	O
a	O
nominal	O
voltage	O
of	O
3.6	O
–	O
3.7	O
volts	O
,	O
and	O
AA-sized	O
cells	O
of	O
this	O
voltage	O
are	O
coded	O
14500	O
rather	O
than	O
AA	B-Algorithm
.	O
</s>
<s>
AA-sized	O
lithium-ion	O
cells	O
with	O
circuitry	O
to	O
reduce	O
the	O
voltage	O
to	O
the	O
1.5V	O
of	O
standard	O
replaceable	O
cells	O
are	O
also	O
made	O
.	O
</s>
<s>
NiMH	B-Device
and	O
lithium-ion	O
AA/14500	O
cells	O
can	O
supply	O
most	O
of	O
their	O
capacity	O
even	O
when	O
under	O
a	O
high	O
current	O
drain	O
(	O
0.5A	O
and	O
higher	O
)	O
,	O
unlike	O
alkaline	B-Algorithm
and	O
zinc-chloride	O
(	O
"	O
Heavy	O
Duty	O
"	O
/	O
"	O
Super	O
Heavy	O
Duty	O
"	O
)	O
cells	O
which	O
drop	O
to	O
a	O
small	O
fraction	O
of	O
their	O
low	O
current	O
capacity	O
before	O
even	O
reaching	O
1	O
C	B-Algorithm
.	O
</s>
<s>
A	O
Li-ion	O
1.5V	O
AA-size	O
battery	O
,	O
sold	O
by	O
the	O
Chinese	O
company	O
Kentli	O
as	O
"	O
Kentli	O
PH5	O
"	O
since	O
2014	O
and	O
with	O
similar	O
batteries	O
later	O
available	O
from	O
other	O
suppliers	O
,	O
is	O
an	O
AA-sized	O
battery	O
housing	O
containing	O
a	O
rechargeable	B-Architecture
3.7V	O
Li-ion	O
cell	O
with	O
an	O
internal	O
buck	O
converter	O
at	O
the	O
positive	O
electrode	O
to	O
reduce	O
the	O
output	O
voltage	O
to	O
1.5V	O
.	O
</s>
<s>
The	O
Kentli	O
batteries	O
expose	O
the	O
normal	O
3.7V	O
Li-ion	O
electrode	O
in	O
a	O
ring	O
around	O
the	O
AA	B-Algorithm
electrode	O
to	O
allow	O
charging	O
by	O
a	O
special	O
charger	O
.	O
</s>
<s>
It	O
supplies	O
the	O
same	O
1.5V	O
as	O
a	O
fresh	O
disposable	O
alkaline	B-Algorithm
AA	B-Algorithm
cell	I-Algorithm
,	O
but	O
with	O
virtually	O
no	O
drop	O
over	O
the	O
discharge	O
cycle	O
,	O
unlike	O
other	O
disposable	O
or	O
rechargeable	B-Architecture
cells	O
.	O
</s>
<s>
Its	O
lithium-ion	O
chemistry	B-Algorithm
provides	O
a	O
low	O
self-discharge	O
of	O
3%	O
per	O
month	O
.	O
</s>
<s>
Some	B-Algorithm
later	O
Li-ion	O
AA	B-Algorithm
batteries	I-Algorithm
advertise	O
their	O
capacity	O
in	O
milliwatt-hours	O
(	O
mWh	O
)	O
instead	O
of	O
the	O
usual	O
milliampere-hours	O
(	O
mAh	O
)	O
,	O
so	O
a	O
customer	O
's	O
attention	O
is	O
drawn	O
to	O
the	O
figure	O
,	O
typically	O
a	O
claimed	O
3,000	O
or	O
more	O
,	O
which	O
is	O
in	O
reality	O
2,000	O
mAh	O
.	O
</s>
<s>
By	O
2023	O
,	O
several	O
brands	O
of	O
1.5V	O
Li-ion	O
rechargeable	B-Architecture
batteries	I-Architecture
in	O
both	O
AA	B-Algorithm
and	O
AAA	B-Algorithm
sizes	O
(	O
with	O
voltage	O
converting	O
circuitry	O
in	O
even	O
the	O
small	O
AAA	B-Algorithm
casing	O
)	O
were	O
available	O
in	O
2023	O
.	O
</s>
<s>
Some	B-Algorithm
have	O
special	O
chargers	O
—	O
a	O
charger	O
for	O
a	O
1.2V	O
cell	O
will	O
not	O
provide	O
sufficient	O
voltage	O
—	O
but	O
do	O
not	O
use	O
a	O
third	O
electrode	O
.	O
</s>
<s>
Nickel-zinc	O
cell	O
(	O
NiZn	O
)	O
rechargeable	B-Architecture
1.65V	O
AA	B-Algorithm
and	O
AAA	B-Algorithm
cells	I-Algorithm
are	O
also	O
available	O
,	O
but	O
not	O
widely	O
used	O
.	O
</s>
<s>
energy	O
at	O
nominal	O
voltage	O
and	O
50	O
mA	O
drain	O
(	O
Wh	O
)	O
Rechargeable	B-Architecture
Zinc	B-Algorithm
–	I-Algorithm
carbon	I-Algorithm
R6	O
15D	O
1.50	O
400	O
–	O
1,700	O
2.55	O
Alkaline	B-Algorithm
LR6	B-Algorithm
15A	O
1.50	O
1,800	O
–	O
2,850	O
3.90	O
Li-FeS2	O
FR6	O
15LF	O
1.50	O
2,700	O
-3	O
,	O
400	O
5.10	O
Li-ion	O
?	O
</s>
<s>
?	O
R15/50	O
14500	O
3.60	O
–	O
3.70	O
600-1	O
,	O
100	O
(	O
1,600	O
mAh	O
at	O
1.5V	O
)	O
3.88	O
LiFePO4	O
14500	O
3.2-3.3	O
600-1	O
,	O
000+	O
2.80	O
NiCd	O
KR6	O
15K	O
1.20	O
600	O
–	O
1,000	O
1.20	O
NiMH	B-Device
HR6	O
15H	O
1.20	O
600	O
–	O
2,750	O
3.42	O
NiZn	O
ZR6	O
?	O
</s>
<s>
In	O
2011	O
,	O
AA	B-Algorithm
cells	I-Algorithm
accounted	O
for	O
approximately	O
60%	O
of	O
alkaline	B-Algorithm
battery	I-Algorithm
sales	O
in	O
the	O
United	O
States	O
.	O
</s>
<s>
In	O
Japan	O
,	O
58%	O
of	O
alkaline	B-Algorithm
batteries	I-Algorithm
sold	O
were	O
AA	B-Algorithm
,	O
known	O
in	O
that	O
country	O
as	O
tansan	O
( 単三	O
)	O
.	O
</s>
<s>
In	O
Switzerland	O
,	O
AA	B-Algorithm
batteries	I-Algorithm
totaled	O
55%	O
in	O
both	O
primary	O
and	O
secondary	O
(	O
rechargeable	B-Architecture
)	O
battery	O
sales	O
.	O
</s>
