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ENGLISH
SAVE THESE INSTRUCTIONS
Chargers 
The SC121 chargers accept 10.8V Li-Ion batteries. 
These chargers require no adjustment and are designed to be 
as easy as possible to operate.
Charging Procedure (g. 2)
1. Plug the charger (j) into an appropriate outlet before
inserting battery pack.
2. Insert the battery pack (g) into the charger. The red
(charging) light will blink continuously indicating that the
charging process has started.
3. The completion of charge will be indicated by the red
light remaining ON continuously. The pack is fully
charged and may be used at this time or left in the
charger.
NOTE: To ensure maximum performance and life of Li-Ion 
batteries, charge the battery pack fully before first use.
Charging Process
Refer the tables below for the state of charge of the battery 
pack. 
State of charge–SC121
  charging  ––  ––  ––  ––   –– 
  fully charged  –––––––––––––––––––– 
  hot/cold pack delay  ––  ––  ––   ––––––– 
HOT/COLD PACK DELAY
SC121
When the charger detects a battery that is hot, it automatically 
delays charging until the battery has cooled. 
When the charger detects a battery that is cold, it 
automatically delays charging until the battery has warmed. 
The red light will continue to blink, but a yellow indicator light 
will be illuminated during this operation. Once the battery 
has cooled, the yellow light will turn off and the charger will 
resume the charging procedure.
Stanley 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.
LI-ION BATTERY PACKS ONLY 
Li-Ion batteries 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.
Important Safety Instructions for All Battery 
Packs
When ordering replacement battery packs, be sure to include 
catalog number and voltage. 
The battery pack is not fully charged out of the carton. 
Before using the battery pack and charger, read the safety 
instructions below. Then follow charging procedures outlined.
READ ALL INSTRUCTIONS
• Do not charge or use battery in explosive
atmospheres, such as in the presence of flammable
liquids, gases or dust. Inserting or removing the
battery from the charger may ignite the dust or fumes.
•  Never force battery pack into charger. Do not modify
battery pack in any way to fit into a non-compatible
charger as battery pack may rupture causing serious 
personal injury. 
• Charge the battery packs only in STANLEY chargers.
•  DO NOT splash or immerse in water or other liquids.
• Do not store or use the tool and battery pack in
locations where the temperature may reach or
exceed 40 ˚C (105 ˚F) (such as outside sheds or 
metal buildings in summer).
 WARNING: Never attempt to open the battery 
pack for any reason. If battery pack case is 
cracked or damaged, do not insert into charger. 
Do not crush, drop or damage battery pack. 
Do not use a battery pack or charger that has 
received a sharp blow, been dropped, run over 
or damaged in any way (i.e., pierced with a nail, 
hit with a hammer, stepped on). Electric shock 
or electrocution may result. Damaged battery 
packs should be returned to service centre for 
recycling.
 CAUTION: When not in use, place tool on 
its side on a stable surface where it will not 
cause a tripping or falling hazard. Some 
tools with large battery packs will stand upright 
on the battery pack but may be easily knocked 
over. 
SPECIFIC SAFETY INSTRUCTIONS FOR LITHIUM ION 
(Li-Ion)
• Do not incinerate the battery pack even if it is
severely damaged or is completely worn out. The 
battery pack can explode in a fire. Toxic fumes and
materials are created when lithium ion battery packs are
burned.