<s>
IUoU	B-Algorithm
is	O
a	O
DIN-designation	O
(	O
DIN	B-Application
41773	O
)	O
for	O
a	O
lead-acid	B-Device
battery	I-Device
charging	O
procedure	O
that	O
is	O
also	O
known	O
as	O
3-stage	O
charging	O
,	O
3-phase	O
charging	O
,	O
or	O
3-step	O
charging	O
.	O
</s>
<s>
It	O
consists	O
of	O
three	O
phases	O
(	O
or	O
stages	O
)	O
,	O
to	O
be	O
executed	O
by	O
a	O
battery	B-Application
charger	I-Application
.	O
</s>
<s>
This	O
phase	O
occurs	O
when	O
an	O
IUoU	B-Algorithm
charger	O
is	O
connected	O
to	O
a	O
deeply	O
discharged	O
battery	O
.	O
</s>
<s>
+	O
3-stage	B-Algorithm
battery	I-Algorithm
charging	I-Algorithm
voltages	O
and	O
currents	O
at	O
20	O
°C	O
(	O
72	O
°F	O
)	O
Battery	O
type	O
Ref	O
.	O
</s>
