DeWalt DC300 Instruction Manual page 11

Charger Diagnostics
This charger is designed to detect certain problems that can arise with
the battery packs or the charger. Problems are indicated by the three
red lights fl ashing together in different patterns.
PROBLEM POWERLINE
When the charger is used with some portable power sources such
as generators or sources that convert DC to AC, the charger may
temporarily suspend operation. The three red lights will fl ash together
with two fast blinks followed by a pause. This indicates that the
power souce is out of limits.
BAD BATTERY
The charger can detect a weak or damaged battery. The three red
lights will fl ash together with rapid blinking. The battery will no longer
charge and should be returned to a service center or a collection site
for recycling.
BAD CHARGER
The charger will detect if it is not functioning properly. The three red
lights will fl ash together with one fast blink followed by a long
blink. The charger will no longer work and should be returned to an
authorized service center or replaced.
LEAVING THE BATTERY IN THE CHARGER
The charger and battery pack can be left connected with the red lights
glowing indefi nitely. The charger will keep the battery pack fresh and
fully charged. This charger features an automatic tune-up mode which
equals or balances the individual cells in the battery pack to allow it to
function at peak capacity. Battery packs should be tuned up weekly
or whenever the battery no longer delivers the same amount of work.
To use the automatic tune-up mode, place the battery pack in the
charger and leave it for at least 8 hours.
Important Charging Notes
1. Longest life and best performance can be obtained if the battery
pack is charged when the air temperature is between 65 °F and
75 °F (18 °–24 °C). DO NOT charge the battery pack in an air
temperature below +40 °F (+4.5 °C), or above +105 °F (+40.5 °C).
This is important and will prevent serious damage to the battery
pack.
2. The charger and battery pack may become warm to touch while
charging. This is a normal condition, and does not indicate a
problem. To facilitate the cooling of the battery pack after use,
avoid placing the charger or battery pack in a warm environment
such as in a metal shed, or an uninsulated trailer.
3. If the battery pack does not charge properly:
a. Check operation of receptacle by plugging in a lamp or other
appliance;
b. Check to see if receptacle is connected to a light switch which
turns power off when you turn out the lights;
c. Move charger and battery pack to a location where the
surrounding air temperature is approximately 65 °F–75 °F
(18 °– 24 °C);
d. If charging problems persist, take the tool, battery pack and
charger to your local service center.
4. The battery pack should be recharged when it fails to produce
suffi cient power on jobs which were easily done previously. DO
NOT CONTINUE to use under these conditions. Follow the
charging procedure. You may also charge a partially used pack
whenever you desire with no adverse affect on the battery pack.
5. Under certain conditions, with the charger plugged into the power
supply, the exposed charging contacts inside the charger can
be shorted by foreign material. Foreign materials of a conductive
nature such as, but not limited to, grinding dust, metal chips, steel
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