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Battery Pack Specifications
Capacity
CTB4147. ..................................................2.5 Ah
CTB4187/CTB4187A. ................................2.5 Ah
Voltage
CTB4147 ................... 14.4 VDC (1.2 V x 12 cells)
CTB4187/CTB4187A ...........................................
................................. 18.0 VDC (1.2 V x 15 cells)
Type ............................................ Nickel-cadmium
Life .......................................................................
.....600 cycles (1 cycle=1 charge and 1 discharge)
Charge Time ............................................~45 min
Weight
CTB4147 ................................... 1.9 lbs (0.86 kg)
CTB4187/CTB4187A ................. 2.4 lbs (1.09 kg)
Battery Pack
Storage
Do not expose your battery pack to water or rain; this
could damage the battery pack.
Fully charge the battery before placing it in storage. For
optimum life, store the all Ni-Cad and Lithium-Ion
batteries at room temperature away from moisture.
Permanent capacity loss can result if batteries are stored
for a long period at high temperature, over 120°F(49°C).
Maintenance
When charging or discharging a nickel-cadmium battery
over a short period of time, the internal temperature of
the battery pack increases substantially. This is normal.
Be sure the battery pack cools to room temperature
before recharging or reusing. This assures longer battery
life and better performance.
A battery pack that is new or has not been used for a long
period of time may not accept a full charge. The battery
pack may not perform at optimum levels. These
conditions are normal and can be corrected.
• Maximize battery life and performance by discharging
the battery pack fully before attempting to recharge.
Do not drain the battery to an absolute zero charge,
only until the tool does not operate.
• Be sure the battery pack cools to room temperature
before recharging.
• After the battery pack is charged and discharged
completely two or three times the battery pack returns
to optimum operating condition.
— A battery pack discharges by itself when stored
for six months or more. This can affect the
performance of a battery pack. Use the
information in this section to recondition the
battery pack.
ZCTB4185 Rev. E
• Under ideal working conditions the useful life of this
battery pack is around 600 charge/discharge cycles.
Improper care and maintenance shortens battery life
and the amount of time the battery holds a charge.
• Use only with Snap-on charging equipment that specifies
a CTB series battery pack.
• Charge the battery pack at room temperature for
optimum life.
• Avoid short circuiting the battery pack. Permanent
damage to the pack can occur from high current
discharge.
• Unplug charger from outlet before starting the
disassembly procedure.
• Remove the battery pack from the tool before starting
the disassembly procedure. Short-circuiting the battery
pack can cause fire or personal injury.
• Use safety equipment. Always wear eye protection.
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