# FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack

FSKE KB440-03H is a two-pack of rechargeable lithium-ion replacement batteries listed for Kobalt 40V power tools. Each battery is specified at 6 amp-hours, with four LED fuel indicators for checking the charge level. Compatibility depends on the tool and charger model, so compare your model numbers with the listing before buying.

- [Original product page](https://best-deals.pro/product/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [View offer](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- Market: US
- Language: en-US
- Currency: USD
- Brand: FSKE
- Model: KB440-03H
- Price: 98.99 USD
- Previous price: 119.99 USD
- Discount: 18%
- Price checked: 2026-11-14T07:07:32.183Z
- Rating: 4.4 / 5
- Reviews: 389

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- Two batteries are claimed in the title and feature listing, providing a spare for compatible equipment.
- The listing specifies 40 volts and 6 amp-hours per battery.
- Four LED fuel indicators are described, with each light representing 25% of battery power.
- Compatibility is stated for selected Kobalt 40V tools and chargers. Check the exact model before relying on fit.

## Pros

- Two-pack format can provide a charged spare while another battery is in use.
- Four charge-level indicators provide a quick visual estimate of remaining battery power.
- The listing names several compatible Kobalt 40V tool and charger models.

## Specifications

### Identity
- Brand: FSKE
- Model: KB440-03H
### Power and battery
- Battery type: Lithium Ion
- Voltage: 40 volts
- Capacity: 6 amp\_hours
- Rated current capacity: 6000 milliamps
- Rechargeable: Rechargeable
### Compatibility
- Listed tool compatibility: Replacement for Kobalt 40V Battery 6.0Ah, Compatible with Kobalt 40V Cordless Power Tool, for 40V Max Battery KB440-03 KB2540C-06 KB240-03 KRC60
- Listed charger models: KRC60-06, KRC40-06, KRC840-03
### Dimensions and installation
- Dimensions listed: 6.69 x 4.33 x 1.97 inches
- Weight listed: 5.6 pounds

## Before you buy

- The listing has inconsistent quantity and weight details: the title and feature text claim two batteries, while the battery-count field says one battery is included, and listed battery weight is 2.7 pounds while item weight is 5.6 pounds. Confirm the selected listing's quantity and package details. Compatibility is also stated for specific Kobalt model numbers, so verify your tool and charger model before purchase. The claimed 50% more power than a 4.0 battery and other performance statements are manufacturer claims, not independently confirmed here.

## A good fit for

- Kobalt 40V tool owners seeking a listed 6Ah replacement and a second battery for rotation.
- Buyers whose tool and charger model numbers match those named in the compatibility details.

## Less suited to

- Owners of tools or chargers outside the listed compatibility range unless compatibility is confirmed.
- Buyers who need independently established battery runtime, cycle life, or charging performance.

## Customer feedback

Aggregate customer ratings lean positive, with most recorded ratings in the five-star category, but a meaningful portion are one-star and the spread does not explain the reasons. No written customer feedback is supplied, so the ratings cannot establish performance or compatibility. For buyers, confirming model fit and the advertised two-battery quantity matters more than inferring runtime or reliability from the rating pattern.

## Frequently asked questions

### How many batteries are included?
The title and feature text describe a two-pack, but the battery-count field says one battery is included. Confirm the quantity on the selected listing before ordering.
### Which tools and chargers are listed as compatible?
The listing names selected Kobalt 40V tools, including models KB440-03, KB2540C-06, and KB240-03, and chargers KRC60-06, KRC40-06, and KRC840-03. Check your exact model.
### What does the LED indicator show?
The listing describes four fuel indicators, with each light representing 25% battery power. This is a charge-level indication, not a stated runtime estimate.
### Is the stated 6Ah capacity independently verified?
No independent measurement is provided. The listing specifies 6 amp-hours and 6000 milliamps as manufacturer claims.

## Alternative options

- [DTK Replacement for Kobalt 40V Battery 6000mAh KPM1040A-03, KM-1640-06, KM 4040-06, Cordless Power Tool Batteries 2 Packs](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
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- [DTK Upgraded Replacement for Kobalt 40V Battery MAX 6200mAh KPM1040A-03, KM-1640-06, KM 4040-06,Cordless Power Tool Batteries](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [2 Pack 3.0Ah Battery Replacement for Kobalt 40V Battery \| Compatible with KB 245-06...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [DTK Replacement for Kobalt 40V Battery 5600mAh \| KB240-06 KB2540C-06 KB240-03 KB440-03 KM 2041B-06, KPM1040A-03, KM-1640-06, KM 4040-06, Cordless Power Tool Battery](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [DTK Replacement for Kobalt 40V Battery MAX 3000mAh KM 2041B-06, KPM1040A-03, KM-1640-06, KM 4040-06 Cordless Power Tool Battery 2 Packs](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [40V Replacement for Kobalt 40v Battery 6.0Ah MAX 2540C-06, Rechargeable Lithium Ion...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [40V 6.0Ah Battery and Charger Kit Replace for Kobalt KB-540-06 KRC40-06 \| 3A, Compa...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [6.0Ah 40-Volt Battery Replacement for Kobalt 40V Battery \| Compatible for Kobalt 40...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [Upgraded 6.0Ah Lithium 40V Battery Replacement For Kobalt 40V Max Battery \| Compati...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)
- [6.0Ah 40V Battery for Kobalt, High Capacity 40V Rechargeable Battery \| Compatible w...](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)

## Add-ons

- [YJITO 40V Fast Charger for Kobalt 40V Battery \| Only compatible for Kobalt 40-Volt Li-Ion Battery KB 240-06 KB 440-06 KB 540-06 KB 245-06 KB 340-06](https://best-deals.pro/visit/fske-kb440-03h-40v-6ah-replacement-battery-2-pack)

## Images

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 1](https://best-deals.pro/i/o9udMROXMdopVDMgMEkfyIMuyh_4bP3VnicYauiXzdFiedA-nd2q9cTppMw2IgSSe-JVwbBtTM15_jg_V07ZbtO9XDtKr2v24CPkMrxP-a8uVzUWKJ0lz8zi.jpg)

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 2](https://best-deals.pro/i/o1tZM1tKuQld6pOOq8NmSBGZlaCYMQ0KJIONDLzCWVkTyVSvuZAbXjMtylQaAnC-VbJeYvW1i9R5zfpn0J_7M-oT5sMyNhtKNAJKcbXpesd3bZAgqZSB0zsZ.jpg)

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 3](https://best-deals.pro/i/fuqTSFoqwAQjZmCx6wE-pZ1REUHuO1cpj9LsUS-tCbjAiXIsI7qEWOSFgxk14iGx715lmMpkatV123u8jMsVKdcFJAjuT9oltfkdPxxUyLjmZ-d0WNonCKhg.jpg)

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 4](https://best-deals.pro/i/DyEiT4dD_bsPmmLFoJPNVW8uvaT__8X0E8E2D9kamz6KJ7V2jcrqAL41gy_Cc_XHKBmUICYEazXgTU850wPZjokN83g0rRKYS3I63I7PUdLSTazquXPfTMul.jpg)

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 5](https://best-deals.pro/i/qfDIBQNhp1rjnaZDsRxmPOw8isR0a0BmjDQFFiW1-8C2Bxvx_38FA56_Htx9lZPL10t63riXcRwMIQVz6KRPBEOXvPapj59DZ4WGT4jK5x78ub4o28NmklWQ.jpg)

![FSKE KB440-03H 40V 6Ah Replacement Battery, 2-Pack — 6](https://best-deals.pro/i/GF20E0788oQvOVNa0ywQnKT6sanO3xJUKFTFn_V1pyB8VJrtPX8v3khL13QkoXm_O7Rrdngf-G3gPB32r_1rlwO1LwCzsIOiE_lrihUhZTW8F8TR2JnEm_if.jpg)