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DTK 40V 6.6Ah Lithium-Ion Replacement Battery 2-Pack1 / 7
Product guide

DTK 40V 6.6Ah Lithium-Ion Replacement Battery 2-Pack

Lithium-Ion: DTK 40V replacement batteries are listed as a two-pack for compatible Ryobi cordless tools. Each battery is specified at 6.6Ah, and the listing names a broad set of compatible tools and chargers. Confirm your exact model before buying because the compatibility details include exceptions and inconsistencies.

At a glance

  • Two replacement batteries are claimed in the package, along with a manual.
  • The listing states 40V and 6.6Ah capacity for the lithium-ion batteries.
  • Three LED lights are described as charge-level indicators.
  • The compatibility information names many Ryobi 40V tools, batteries and chargers, but also identifies excluded tool models.
Price
$66.00Save 16%

Reference price: $79.00

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

  • A two-battery pack can provide a spare for compatible tools.
  • The stated 6.6Ah capacity is higher than the 2.0Ah reference battery used in the listing's runtime comparison.
  • The listed tool and charger model references help buyers check a specific Ryobi setup.

Technical specifications

11 specifications
Identity
BrandDTK
Power and battery
Battery typeLithium Ion
Voltage40V
Capacity6.6 amp_hours
RechargeableRechargeable
Listed battery weight2 pounds
Compatibility
Compatible battery models listedOP4050A, OP4015, OP4026, OP40201, OP40261, OP4030, OP40301, OP4040, OP40401, OP4050, OP40501, OP40601
Compatible tool models listedRY40180, RY40200, RY40022, RY40201A, RY40202, RY40204, RY40400, R40402, RY40402A, RY40403, RY40403A, RY40411, RY40502A, RY40503, RY40511, RY40601A, RY40LM30, RY40190, RY40430, RY40620, RY40460, RY40250, RY40770, RY40850, RY40610A, RY40210B, RY40240, RY40440.
Compatible charger models listedOP400, OP400A, OP401, OP403, OP403A, OP404A, OP406A, ZROP401
Listing claims
Runtime comparison statedProvides up to 3 times the runtime of a standard 2.0Ah battery
Indicator lights claimedThree LED indicator lights

What to know before buying

  • The listing advises charging with ventilation, letting a warm battery cool before recharging, removing it from tools during extended non-use, and storing it around 50% charge in a cool, dry place.

Listing details to confirm

The listing is inconsistent about pack quantity: its title and package claim say two batteries, while the battery-details field says "1 A batteries required. (included)" and the unit-count field says "2 Count". Capacity is also shown as 6.6Ah and 6600mAh in descriptive text. Compatibility is broad but not uniform: one claim says all Ryobi 40V lithium-ion tools, while another explicitly excludes RY40002 and RY40408. Verify your exact tool and charger model and confirm the selected listing's pack contents before ordering. The claimed runtime comparison and protection features are manufacturer statements, not independently established performance results.

Who is it for?

A good fit for

  • Ryobi 40V tool owners seeking a listed compatible replacement battery set.
  • Buyers who want two batteries and can confirm their tool and charger models against the compatibility list.

Less suited to

  • Owners of RY40002 or RY40408, which the listing says are not compatible.
  • Buyers who need a charger included. No charger is named in the stated package contents.
DTK 40V 6.6Ah Lithium-Ion Replacement Battery 2-Pack · photo 2
Additional product photo 2

Customer reviews on Amazon

4.2 / 5 · 27 ratings
  • 5 stars62%62%
  • 4 stars19%19%
  • 3 stars6%6%
  • 2 stars8%8%
  • 1 star5%5%

Aggregate ratings are generally positive, with most ratings in the five-star category, but lower-star ratings are also present. This small rating snapshot does not explain individual experiences or establish battery performance. For buyers weighing a replacement pack, confirm compatibility and the claimed capacity for the intended tool rather than treating ratings as proof of runtime or fit.

Frequently asked questions

How many batteries are listed in the package?

The title and package description claim two batteries and a manual, but a battery-details field says "1 A batteries required. (included)". Confirm the selected listing's quantity before buying.

Which Ryobi tools does the listing name?

It lists many 40V tool models, including RY40200, RY40204 and RY40403, and explicitly says it does not fit RY40002 or RY40408. Check your exact model because the listing's broad compatibility wording is not consistent with its exceptions.

Is a charger included?

A charger is not listed in the stated package contents. The listing names charger models it claims compatibility with, which does not mean one is included.

What capacity does each battery have?

The listing states 6.6 amp_hours and also describes the capacity as 6600mAh. It claims up to three times the runtime of a standard 2.0Ah battery, but that comparison is a listing claim rather than an independently verified result.

DTK 40V 6.6Ah Lithium-Ion Replacement Battery 2-Pack · photo 3
Additional product photo 3

Alternative options

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