DeWalt DCHT820, Instruction Manual

8

English

   c.  Move the 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.

  5. The battery pack should be recharged when it fails to produce 

sufficient power on jobs which were easily done previously. DO 

NOT CONTINUE to use it under these conditions. Follow the 

charging procedure. You may also charge a partially used pack 

whenever you desire with no adverse effect on the battery pack.

  6. Foreign materials of a conductive nature such as, but not limited 

to, grinding dust, metal chips, steel wool, aluminum foil, or any 

buildup of metallic particles should be kept away from charger 

cavities. Always unplug the charger from the power supply when 

there is no battery pack in the cavity. Unplug the charger before 

attempting to clean it.

  7. Do not freeze or immerse the charger in water or any other liquid.

WARNING: 

Shock hazard. Don’t allow any liquid to get inside the 

charger. Electric shock may result. 

WARNING:

 Burn hazard. Do not submerge the battery pack in 

any liquid or allow any liquid to enter the battery pack. Never attempt 

to open the battery pack for any reason. If the plastic housing of the 

battery pack breaks or cracks, return it to a service center for recycling.

Storage Recommendations

  1. The best storage place is one that is cool and dry, away from direct 

sunlight and excess heat or cold.

 2. For long storage, it is recommended to store a fully charged 

battery pack in a cool dry place out of the charger for optimal 

results.

NOTE:

 Battery packs should not be stored completely depleted of 

charge. The battery pack will need to be recharged before use.

NOTE: 

This could also mean a problem with a charger.

Wall Mounting

These chargers are designed to be wall mountable or to sit upright on 

a table or work surface.
If wall mounting, locate the charger within reach of an electrical outlet. 

Mount the charger securely using drywall screws at least 1” (25.4 mm) 

long, screwed into wood to an optimal depth leaving approximately 

7/32” (5.5 mm) of the screw exposed.

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 +104 °F (+40 °C). 

This is important and will prevent serious damage to the battery 

pack.

  2. The charger and battery pack may become warm to the 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. 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 pack warms.

  4. If the battery pack does not charge properly:
   a.  Check operation of the receptacle by plugging in a lamp or 

other appliance;

    b.  Check to see if the receptacle is connected to a light switch 

which turns the power off when you turn out the lights;