14.4V Cordless Impact Driver Combo Kit

  • 3.3Ah Li-ion Battery
  • Tough IP 56
  • Impact Driver and Drill & Driver


EYC199LR Tough IP™ Li-ion 14.4-volt, 3.3Ah ½” Cordless Drill and Driver and ¼” Hex Impact Driver Kit


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for high-power drilling and fastening in masonry, metal and wood

Construction professionals that drill holes and drive fasteners into wood, metal or concrete plus do repetitive bolt/nut fastening need the versatility of a cordless hammer drill and the adjustable power of an impact driver.

The 14.4-volt EYC199LR packages that versatility into one kit. The ½” EY7441X drill and driver and the EY7546X impact driver stand at the ready to complete a variety of heavy-duty jobs that electricians, general construction contractors, system installers, heating, water and sanitation technicians can throw at them.

Drill/driver versatility

The Panasonic 14.4-volt 3.3Ah EY7441X ½” drill and driver is built to take on jobs professional tradesmen face with versatility and power. The tool is right at home on general construction, plumbing, finish carpentry and electrical installation jobs.

Its compact size – only 7-5/8” long x 9-1/8” tall x 2-3/8” wide – gets it into tight spaces. The tool can produce 390 in.-lbs. of power so it can take on tough tasks such as drilling up to 1-3/8” diameter holes in wood or ½” diameter holes in metal. In driving mode, the tool can drive M5 machine screws, ¼” diameter wood and self-tapping screws easily and repetitively.

The variable speed, reversible tool has a two-speed transmission that efficiently converts the motor’s power into drilling/driving power. Users will find the 50-430 rpm low speed helpful in deep wood-drilling and -driving jobs, while the 160-1,650 rpm high speed works best in most metal-drilling jobs. An electric brake stops chuck spin instantly when the trigger is released. A built-in LED light makes work in dark areas easier and a belt hook keeps the tool close at hand when it’s not in use.

The 18-stage clutch lets the user adjust driving force to the job. It adjusts from approximately 4.4 to 39.0 in. lbs. in 2 in. lbs. increments, so driving force matches driving needs without overdriving or stripping fasteners.

At just 3.85 lbs. including battery, the tool’s light weight and ergonomic design helps keep the user’s wrist in the neutral position. The light weight and tool design work together to cause less fatigue and improve tool control.

Impact driver power

Professional tradesmen often do a wide variety of highly repetitive fastening jobs, and the 14.4-volt EY7546X ¼” hex cordless impact driver has the versatility, power and runtime to excel in heavy driving, demanding fastening or exacting finish-assembly applications. The cordless impact driver has variable speed and three power settings that make it handy for heavy-power or fine-control jobs such as HVAC installation, auto repair, deck building, lag bolt or finish fastening and more.

The High/Hard setting is best for heavy driving jobs such as setting lag bolts, tightening large bolts and nuts or driving long screws. In this setting, it delivers 0-2,500 no-load rpm, 1,370 in. lbs. of torque and 0-3,000 ipm. The Medium setting is suited for driving self-tapping screws and conduit clip fasteners, delivering 0-1,400 no-load rpm, 1,150 in. lbs. of torque and 0-2,800 ipm. For delicate fastening jobs that require controlled power and finesse, such as installing hinges on cabinets and fastening wall plates to electrical boxes, the Low/Soft setting delivers 0-1,000 rpm, 355 in. lbs. of torque and 0-2,000 ipm.

An electric brake stops the ¼” hex quick-connect bit instantly in all modes; a built-in LED light greatly improves work visibility. Weighing just 3.5 lbs. with battery, the compact tool measures just 2-13/32” wide, 9-17/32” tall and 5-5/8” long. A convenient built-in belt hook keeps the tool handy.

High-tech components deliver speed, power and durability

Both tools are powered and controlled by a brushless motor, durable switch and sealed control circuits in the tool body and battery pack. These high-tech and resilient systems deliver top power, speed, runtime and long tool life. Because electronics replace brushes in the tool, the tool creates less heat and uses power much more efficiently than conventional motors found in many cordless tools. That means longer runtimes between charges, cooler operation and longer tool and battery life. Their design also allows them to operate under substantial loads, making it less likely to burn out when used for heavy-duty jobs.

Tough and long-lasting battery packs

The kit comes with two Panasonic 14.4-volt 3.3Ah LR battery packs that are built for heavy use, long runtimes between charges and long cycle life. Unlike manganese-based Li-ion batteries used in many cordless power tools, Panasonic’s exclusive cobalt Li-ion battery technology produces less internal heat buildup that can kill battery packs. The battery packs also feature Panasonic’s Solid Solution technology, a proprietary process for dissolving and hardening cobalt and nickel and other key battery components. This unique chemistry dramatically improves battery pack safety, reliability and power output. A special heat-resistant ceramic coating layer separates cells and protects them from heat buildup. The chemistry, battery design and manufacturing process add up to powerful batteries that promise to deliver long running lives.

Battery packs that are smart, too

Sometimes professional users are their own tool’s worst enemy, attempting to push them past their design limits. This can lead to irreversible battery or tool damage. That’s why Panasonic 3.3Ah LR battery pack cells are independently monitored for even discharge while preventing over-charging and over-discharging. An over-discharge sensor prevents the user from running the tool after it reaches the point where too-low voltage output could damage the battery and the tool. Plus, an internal temperature sensor flashes a warning light if internal temperatures rise, and then cuts off tool power if battery temperature reaches critical levels.

Getting water into the battery doesn’t have to mean it’s a goner. Panasonic engineers have added built-in vents in the battery case so water can easily drain out of the battery pack. The battery, which is easy to remove using a simple slide-down release button, charge to 80 percent capacity in 50 minutes and fully charge in 65 minutes with the EY0L81B charger that comes with the kit.

Tough tools for tough conditions

The drill and driver and impact driver have an IP56 rating that proves the tools’ toughness claims. This rating means the tools have withstood demanding laboratory tests of working in extremely dusty work environments and the effects of water getting sprayed on the tool by powerful jets. In the field, it assures professional tradesmen have tools that can stand up to the rigors of hard jobsite use.

The IP rating is established by the International Electrotechnical Commission (IEC) and is outlined in IEC 60529. The standard outlines a coding system that indicates the degree of protection an electrical machine’s enclosure offers internal components. Based on objective testing, it assigns a rating to the enclosure’s ability to keep potentially damaging solid foreign objects (dust and contaminants) and water out of the tool under increasingly difficult conditions.

The dust protection test subjects the tool to a very dusty environment and then puts it to work to assure the tool was unaffected by dust exposure. In the grueling test, the tools proved that they achieved a dust protection level of five out of six levels; the sixth level is for dust-tight tools. It’s a good indication that the tool design keeps potentially harmful contaminants out, assuring long life and top performance that professionals demand.

Similarly, the water protection test put the tools up against increasing levels of water exposure. They attained a six out of eight levels rating, withstanding the effects of powerful water jets.

Whether it’s extremely dust work conditions or work in damp or wet locations, users will appreciate a tool that will keep working when others would likely fail. Consult the safety and operating instructions for more information.

Learn more about Panasonic's Intelligent Power Tools and the IP56 code, view What Is Tough IP

Kit contents








EY7441X 14.4-volt drill and driver with ½” metal keyless chuck

EY7546X 14.4-volt ½” square chuck impact wrench

EY9L44B 14.4-volt 3.3Ah LR Li-ion battery packs

EY0L81B battery charger

Plastic carrying case

Hammer drill and driver performance

The two-speed drill-driver modes make it easy for users to select speed or power for drilling tasks.

Impact wrench performance





Max. Torque

Speed at No Load


1,330 in.-lbs. (1)

0-2,500 rpm


1,150 in.-lbs. (1)

0-1,400 rpm

0-2,800 ipm

230 in.-lbs. (2)

0-1,000 rpm

0-2,000 ipm

(1) M14 High-Tensile Bolt Tightening for 3 sec.
(2) M10 High-Tensile Bolt Tightening for 3 sec.

SpecificationsExpand All

    • Description
    • Battery Capacity
    • IP Approved
    • Voltage
    • Chuck
    • Compact Size (H x W x D)
    • High Power
    • Electric Brake
    • LED Work Light
    • Belt Hook
    • Charging Time (Usable/Full)
    • RPM - High
    • RPM - Low
    • Description
    • Battery Capacity
    • IP Approved
    • Voltage
    • Chuck
    • Compact Size (H x W x D)
    • High Power
    • Electric Brake
    • LED Work Light
    • Belt Hook
    • Charging Time (Usable/Full)
    • Speed at No Load
    • Impact/min
    • UPC



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