Pentax K-7 Operating Manual page 45

Insert the battery into the camera. Use only a D-LI90 battery.
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
When using the battery for the first time, or when the battery has not been
used in a long time, or when [Battery depleted] appears, recharge the
battery.
Note: AC plug cord "Listed, Type 8PT-2 or NISPT-2, 18/2 flexible
cord, rated 125 V, 7A, minimum 6ft (1.8m)"
Lithium-ion battery
Indicator lamp
AC plug cord
Battery charger
/ Connect the AC plug cord to the battery charger.
,2 Plug the AC plug cord into the power outlet.
Face the • mark on the exclusive battery up and insert it
into the battery charger.
The indicator lamp is lit during charging.
The indicator lamp turns off when the battery is fully charged.
When the battery is fully charged, remove the battery from
the battery charger.