<s>
State	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
(	O
SoC	O
)	O
is	O
the	O
level	O
of	O
charge	O
of	O
an	O
electric	O
battery	O
relative	O
to	O
its	O
capacity	O
.	O
</s>
<s>
An	O
alternative	O
form	O
of	O
the	O
same	O
measure	O
is	O
the	O
depth	B-Algorithm
of	I-Algorithm
discharge	I-Algorithm
(	O
DoD	O
)	O
,	O
calculated	O
as	O
100	O
-	O
SoC	O
(	O
100%	O
=	O
empty	O
;	O
0%	O
=	O
full	O
)	O
.	O
</s>
<s>
In	O
a	O
battery	O
electric	O
vehicle	O
(	O
BEV	O
)	O
,	O
SoC	O
for	O
the	O
battery	B-Algorithm
pack	I-Algorithm
is	O
the	O
equivalent	O
of	O
a	O
fuel	O
gauge	O
.	O
</s>
<s>
It	O
is	O
important	O
to	O
mention	O
that	O
state	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
,	O
presented	O
as	O
a	O
gauge	O
or	O
percentage	O
value	O
on	O
any	O
vehicle	O
dashboard	O
,	O
especially	O
in	O
plug-in	O
hybrid	O
vehicles	O
,	O
may	O
not	O
be	O
representative	O
of	O
a	O
real	O
level	O
of	O
charge	O
.	O
</s>
<s>
Examples	O
of	O
such	O
cars	O
are	O
Mitsubishi	O
Outlander	O
PHEV	O
(	O
all	O
versions/years	O
of	O
production	O
)	O
,	O
where	O
0%	O
of	O
the	O
state	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
presented	O
to	O
the	O
driver	O
is	O
a	O
real	O
20-22	O
%	O
of	O
charge	O
level	O
(	O
assuming	O
zero	O
level	O
as	O
the	O
lowest	O
level	O
of	O
charge	O
permitted	O
by	O
car	O
producer	O
)	O
.	O
</s>
<s>
The	O
state	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
(	O
SOC	O
)	O
can	O
help	O
to	O
reduce	O
electrical	O
car	O
's	O
owners	O
 '	O
anxiety	O
when	O
they	O
are	O
waiting	O
in	O
the	O
line	O
or	O
stay	O
at	O
home	O
since	O
it	O
will	O
reflect	O
the	O
progress	O
of	O
charging	O
and	O
let	O
owners	O
know	O
when	O
it	O
will	O
be	O
ready	O
.	O
</s>
<s>
This	O
method	O
works	O
only	O
with	O
batteries	O
that	O
offer	O
access	O
to	O
their	O
liquid	O
electrolyte	O
,	O
such	O
as	O
non-sealed	O
lead	B-Device
acid	I-Device
batteries	I-Device
.	O
</s>
<s>
More	O
recently	O
immersion	O
refractometry	O
has	O
been	O
shown	O
to	O
be	O
a	O
viable	O
method	O
for	O
continuous	O
monitoring	O
of	O
the	O
state	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
.	O
</s>
<s>
Maxim	O
Integrated	O
touts	O
a	O
combined	O
voltage	O
and	O
charge	O
approach	O
that	O
is	O
claimed	O
superior	O
to	O
either	O
method	O
alone	O
;	O
it	O
is	O
implemented	O
in	O
their	O
ModelGauge	O
m3	O
series	O
of	O
chips	O
,	O
such	O
as	O
MAX17050	O
,	O
which	O
is	O
used	O
in	O
the	O
Nexus	B-Device
6	I-Device
and	O
Nexus	B-Device
9	I-Device
Android	O
devices	O
,	O
for	O
example	O
.	O
</s>
<s>
In	O
combination	O
with	O
coulomb	O
counting	O
,	O
it	O
can	O
make	O
an	O
accurate	O
estimation	O
of	O
the	O
state	B-Algorithm
of	I-Algorithm
charge	I-Algorithm
.	O
</s>
<s>
This	O
method	O
can	O
be	O
used	O
with	O
certain	O
NiMH	B-Device
batteries	I-Device
,	O
whose	O
internal	O
pressure	O
increases	O
rapidly	O
when	O
the	O
battery	O
is	O
charged	O
.	O
</s>
<s>
This	O
method	O
may	O
be	O
improved	O
by	O
taking	O
into	O
account	O
Peukert	B-Algorithm
's	I-Algorithm
law	I-Algorithm
which	O
is	O
a	O
function	O
of	O
charge/discharge	O
current	O
.	O
</s>
