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DEWALT 20V 8.4Ah Replacement Battery - High Capacity for Tools

Name: DEWALT 20V 8.4Ah Replacement Battery - High Capacity for Tools
Brand: DEWALT
SKU: B0FJRL4F84
Price: 35.99 USD
Availability: InStock

Posted Apr 19, 2026

$35.99$69.99

49% OFFYou save $34.00

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(1) Simple Plus+ 20V 8.4Ah Replacement Battery for DEWALT 20V Tools | Compatible with DCB/DCD/DCF/DCG Series | High Capacity & Long-Lasting
Do not expose the battery to the sun or throw it in a fire.
Do not reverse the positive and negative polarities when charging the battery.
Do not disassemble or deform the battery.
Do not immerse the battery in water.
battery can't be charged continuously for more than 24H.
battery is stored in a ventilated and dry environment.
When not in use for a long time, please keep the battery fully charged, at least once every six months.
Prevent the Memory Effect - Keep the battery healthy by fully charging and then fully discharging it at least once every two to three weeks.
Exercise the Battery - Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks.
Charge battery - Remove the battery pack from the charger once it is fully charged and ready for use.

Great Deal

This Simple Plus+ 20V 8.4Ah battery is on sale for $35.99, a 49% discount. It's a high-capacity replacement for many DEWALT 20V cordless tools. It's a good pick if you need more runtime for your drills, drivers, or grinders.

What we like

High 8.4Ah capacity for longer tool runtime
Compatible with many DEWALT 20V Max tools
Price is about half the typical cost
Simple drop-in replacement for original batteries

Watch out for

Not compatible with DEWALT FlexVolt tools
Requires careful handling per safety warnings

Tip: Check your tool's model number to confirm it's in the DCB, DCD, DCF, or DCG series.

Our Take

Best for: DEWALT 20V tool owners who need longer runtime for demanding projects.

This Simple Plus+ battery is a third-party replacement designed to get your DEWALT 20V tools back to work. You'd pick this over a standard 2Ah or 4Ah battery when you have a big job and don't want to stop and swap batteries constantly. The 8.4Ah rating is the main feature, promising significantly more runtime per charge for tools like drills, impact drivers, and grinders. It's a straightforward product: it charges in a DEWALT charger and slides into your tool. A notable limitation is that it won't work with DEWALT's FlexVolt system, so it's strictly for the standard 20V Max lineup. At this sale price, it's a very cost-effective way to add a high-capacity battery to your kit, especially if your original batteries are aging.

Price Analysis

At $35.99, this battery is priced well below its listed original price of $69.99. For a high-capacity 8.4Ah battery, this is a strong value. While we don't have specific price history, comparable third-party and OEM batteries often sell for $60 or more, making this a good time to buy if you need the capacity.

Common Questions

Is this an official DEWALT battery?

No, this is a third-party replacement battery from Simple Plus+ that is designed to be compatible with DEWALT 20V Max tools.

Will this battery work with my DEWALT 20V drill?

Yes, it is compatible with tools in the DCD (drill), DCF (impact driver), DCG (grinder), and DCB series that use the standard 20V Max battery platform.

How long does this 8.4Ah battery last?

Runtime varies by tool and task, but an 8.4Ah battery should last roughly twice as long as a common 4.0Ah battery under similar conditions.