DeWalt XR LI-ION DCB090 Original Instructions Manual page 47

Charging Process
Refer to the table below for the state of charge of the battery pack.
State of charge
charging
fully charged
hot/cold pack delay
x
problem pack or charger
problem powerline
This charger will not charge a faulty battery pack. The charger will
indicate faulty battery by refusing to light or by displaying problem pack
or charger blink pattern.
NOTE: This could also mean a problem with a charger.
If the charger indicates a problem, take the charger and battery pack to
be tested at an authorised service centre.
Hot/Cold Pack Delay
When the charger detects a battery that is too hot or too cold, it
automatically starts a hot/cold pack delay, suspending charging until
the battery has reached an appropriate temperature. The charger then
automatically switches to the pack charging mode. This feature ensures
maximum battery life.
XR Li-Ion tools are designed with an Electronic Protection System
that will protect the battery against overloading, overheating or deep
discharge.
The tool will automatically turn off if the Electronic Protection System
engages. If this occurs, place the Li-Ion battery on the charger until it is
fully charged.
A cold battery pack will charge at about half the rate of a warm battery
pack. The battery pack will charge at that slower rate throughout the
entire charging cycle and will not return to maximum charge rate even if
the battery warms.
E NGLI SH
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