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How Long Do Dewalt 20V Batteries Last? [TESTED]

Dewalt 20v batteries come in different capacities. The total amp-hours decide how long it will last in a single charge.

Following is the list of Dewalt 20v Lithium-Ion Batteries:

  1. 20V MAX 1.5Ah Compact Battery (DCB201)
  2. 20V MAX 1.7 Ah DEWALT POWERSTACK™ Compact Battery
  3. 20V MAX 2.0Ah Battery (DCB203G/DCB203/DCB203BT)
  4. 20V MAX 3Ah Battery (DCB200/DCB230)
  5. 20V MAX 4Ah Lithium Ion Battery Pack (DCB204-B3/DCB240)
  6. 20V MAX 5Ah Battery (DCB205/DCB205G/DCB205BTLR/DCB205-B3)
  7. 20V MAX 6Ah Battery (DCB206/DCB606)
  8. 20V MAX 8Ah Battery (DCB208)
  9. 20V/60V MAX 9.0Ah Battery (DCB609G)
  10. 20V MAX 10.0Ah Lithium Ion Battery (DCB210)

But the question is…

FOR WHAT TASK do you need the runtime?

Many factors affect the total run-time for Dewalt 20v Batteries. Therefore, I have selected a medium-duty task of driving 1½-inch #10 wood screws into a common pine to find how long a single battery will last on a single charge.

How Long Do Dewalt 20v Batteries Last?

A Dewalt 20v 1.5Ah battery can last a continuous 27 mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 1.5Ah battery Runtime

A Dewalt 20v 1.7Ah battery can last a continuous 39 mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 1.7Ah battery Runtime

A Dewalt 2.0Ah battery can last a continuous 43 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 2.0Ah battery Runtime

A Dewalt 3.0Ah battery can last a continuous 56 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 3.0Ah battery Runtime

A Dewalt 4.0Ah battery can last a continuous 1 Hour 19 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 4Ah battery Runtime

A Dewalt 5.0Ah battery can last a continuous 1 Hour 39 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 5Ah battery Runtime

A Dewalt 6.0Ah battery can last a continuous 2 Hour 06 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 6Ah battery Runtime

A Dewalt 8.0Ah battery can last a continuous 2 Hour 38 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 8Ah battery Runtime

A Dewalt 9.0Ah battery can last a continuous 3 Hour 08 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 9Ah battery Runtime

A Dewalt 10.0Ah battery can last a continuous 3 Hour 31 Mins for medium to heavy-duty tasks, like driving 1½-inch #10 wood screws into common pine.

Dewalt 20v 10Ah battery Runtime
Dewalt BatteryDewalt DrillScrew SizeMaterialRuntimeTotal Screws
20V 1.5Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood 27 mins207
20V 1.7Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood39 mins243
20V 2.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood 43 mins267
20V 3.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood56 mins405
20V 4.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood1 Hour 19 mins438
20V 5.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood1 Hour 39 mins684
20V 6.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood2 Hour 06 mins826
20V 8.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood2 Hour 38 mins1109
20V 9.0Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood3 Hour 08 mins1230
20V 10Ah1/2″ Brushless1½-inch #10 wood screwsCommon Pine Wood3 Hour 31 mins1367

Factors Affecting Total Runtime of Dewalt 20V Battery

The total runtime of a Dewalt 20V battery largely depends on multiple factors and can vary from one situation to another.

Battery Size of Dewalt 20V Battery:

The first thing which affects the overall runtime of a Dewalt 20V battery is the amp hours. Amp hours is the amount of continuous current a battery can provide for one hour.

Current then translates into the amount of power a battery can deliver.

Power Output = Voltage x Amp-Hour

Below is a chart for how many watts a Dewalt 20V battery can provide for a fixed duration before it runs out of charge.

These are theoretical numbers. The actual figures will be 10%-15% lower. The overall capacity will drop 20% after 300-500 cycles of usage.

Dewalt 20V BatteryPower Output
(1 Hour)
Power Output
(30 Mins)
Power Output
(15 Mins)
18V 1.5Ah27 Watts54 Watts108 Watts
18V 2.0Ah36 Watts72 Watts144 Watts
18V 4.0Ah72 Watts144 Watts292 Watts
Dewalt 20V Battery Watts Output Per Hour

Type of Work You Are Using Yous Dewalt 20V Battery For:

As explained in the last heading, the overall run-time of a Dewalt 20V battery largely depends on what task are you doing.

For example, drilling in concrete will yield low runtimes, while driving screws in softwood will give phenomenal runtimes.

Similarly, a circular saw cutting a soft wooden board will yield different results than a hard oak wood block.

The run-time is directly proportional to usage and power output. Below is a very rough comparison.

Dewalt 20V BatteryTaskMaterialRuntime
18V 2.0AhDrillingSoft Wood20-30 Mins
18V 2.0AhDrillingHard Wood15-20 Mins
18V 2.0AhDrillingConcrete10-15 Mins
Dewalt 20V Battery Runtime Vs. Material

Operating Temperature of Dewalt 20V Battery:

The total runtime of an 20V Dewalt lithium-ion battery highly depends on the battery temperature. The temperature of the battery also affects the battery’s overall cycles.

Temperature vs. Runtime of a Dewalt 20v Battery
Temperature vs. Runtime of a Dewalt 20V Battery

Dewalt 20V batteries come with a temperature sensor. As soon as the temperature reaches a set threshold, a Dewalt tool will stop working to avoid damage to your 20V HART battery.

Run-Cycles Vs. The runtime of Dewalt 20V Battery:

The overall run time of a Lithium-Ion Dewalt 20V battery drops as it ages. Following is a chart describing the runtime of a 2oV 2 Amp Hour Battery after a certain number of run cycles.

Battery Cycles vs. Runtime in Mins Dewalt 20V Lithium Ion Battery

Brushed vs. Brushless Motor:

Brushless motors are a lot more energy efficient than brushless motors. The energy efficiency comes due to the absence of physical brush contacts present in brushed motors.

The contacts produce a lot of heat and waste energy. So, the overall runtime of a Dewalt 20V battery dramatically depends on the type of motor used in your tool.

All Dewalt tools are NOT powered by BRUSHLESS motors, so the runtime can be slighlty lower for non-brusless tools than mentioned above.

Below is a great video to understand the differences between a brushed and brushless motor.

Condition of Your Dewalt Cordless Tool:

A brand new Dewalt tool will run longer than an old one on the same battery. New tools are efficient with minimal friction inside their mechanical components.

The losses inside an old clumsy Dewalt tool will yield lower run times. So make sure your tools are properly lubricated and in good condition before planning to change your batteries.

How Long Will a Dewalt 20V Battery Last in term Life Cycle?

Dewalt 20V Batteries are lithium-ion batteries. Dewalt uses high-quality Li-Ion cells, which last longer than low-quality cheap drills, which cost the same as a Ryobi drill Battery with a battery and charger.

Under normal conditions, your drill battery will last 4-6 years or 500-800 cycles. The overall life of your Dewaltnbattery highly depends on operating temperatures, workload, charging & discharging behavior.

Operating Temperatures:

The overall life cycle of an 18V Dewalt battery highly depends on the operating temperatures.

Below is a graph showing the effect of temperature vs. Life Cycles of a Dewalt 20V Battery.

Life Cycle vs. Temperature of Dewalt 20V Battery
Life Cycle vs. Temperature of Dewalt 20V Battery

Charging and Discharging Behaviour:

Ok, so there are a few things you should take care of related to your 18V Lithium-ion Dewalt batteries.

For the best overall life cycle, the best practice is to recharge your battery as soon as your tool starts showing signs of a lower battery.

Don’t wait for your battery to fully discharge before you charge it again to avoid losing life cycles.

Another thing you should take care of is to avoid storing a fully charged or fully discharged battery. This is the biggest reason for destroying your battery life cycle.

Fully charged batteries affect the internal chemistry if kept for a long term, like a few weeks or months.

Similarly, a fully discharged Dewalt 20V battery will keep losing charge and reach a point where the terminal voltage is too low to be detected by a charger.

This will also affect your Dewalt 20V battery’s overall life.

How Long Does it Take to Charge an Dewalt 20V Battery?

Different Dewalt batteries will require different amounts of time to fully charge. The charging time is also dependent on the type of charger being used.

Fast chargers usually take 15-18 mins to fully charge a 1 Amp-Hour battery. Slow conventional chargers are much slower and will take around 1 hour to charge a 1.0 amp hour Dewalt battery.

Dewalt BatteryFast ChargerSlow Charger
20V 1.5Ah28 Mins1 Hour 10 Mins
20V 2.0Ah34 Mins1 Hour 43 Mins
20V 4.0Ah1 Hour 18 Mins3 Hour 08 Mins
20V 6.0Ah2 Hour 08 Mins4 Hour 40 Mins
20V 9.0Ah3 Hour 12 Mins7 Hour 20 Mins

Additional Read:

  1. Charge Craftsman 20V Battery Without Charger [Avoid THIS]
  2. How to drill plexiglass without cracking?
  3. 15 Steps To Drill Into Metal: A Complete & Easy Guide