The Best Kobalt 40V 4.0 Ah Battery of 2022 – Reviews & Buying Guide

After hours researching and comparing all models on the market, we find out the Best Kobalt 40V 4.0 Ah Battery of 2022. Check our ranking below.

2,429 Reviews Scanned

SaleRank No. #1

40-Volt 4-Amps 4.0ah Rechargeable Lithium Ion (Li-Ion) Cordless Power Equipment Battery for Kobalt

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SaleRank No. #2

Supowill 40V 4.0Ah Replacement for Kobalt 40V Battery Kobalt KB2540C-06 Lithium Ion Battery KB440-03 KB640-03 KB240-06 KB240C-06 KB640-06 KB245-06 Kb540-06 ‎Cordless Power Tool Battery

🏡[ Upgraded Battery for 4X Longer Runtime ]🌟: Type: Lithium-ion | Voltage: 40V | Capacity: 4000mAh | Watt: 160Wh (Offers 4X More Power than the Original Kobalt 40V 4.0Ah Battery, Makes Your Tools More Runing Time.)
🎁[ Perfect Replacement For Kobalt 40V Battery ]🔌: 40V 4.0Ah Real Capacity Replacement Battery for Kobalt KB440-03 KB640-03 KB240-06 KB240C-06 KB640-06. 100% Compatible with Kobalt 40V Battery Chargers: KRC60-06 KRC40-06 KRC 840-03. Fit For All Kobalt 40V Tools. Makes Your Tools More Runing Time.
🔋[ Longevity Enhanced & Smart Ecp Protection ]👍: With a Recharge Cycle of 1000 Times and a Mere 1% Self-discharge Rate, The Supowill Replacement for Kobalt 40V Battery Ensures Flawless Operation for Up to 5 Years. Enhanced by a Battery Management System (BMS), It Provides Effective Protection Against Potential Damage from Short Circuits, Overcharging/Discharging, Over-voltage, and Overheating.
👷[ Don't Buy Inferior or Uncertified Batteries ]🔐: Do not purchase low-quality batteries (unauthorized batteries), be cautious as batteries may turn into 'bombs.' Supowill all products are certified by 𝐔𝐋/𝐂𝐄/𝐂𝐄/𝐅𝐂𝐂/𝐏𝐒𝐄/𝐑𝐎𝐇𝐒/𝐈𝐒𝐎𝟗𝟎𝟎𝟏/𝐂𝐁/𝐌𝐒𝐃𝐒/𝐔𝐍𝟑𝟖.𝟑, Fully Certified,Guaranteed Safety.
📧[ 2 Year Free Full Refund Or Replacement Only, No Repair] 💝: If You Have Any Questions About The Replacement For Kobalt 40V Battery, You Can Click The "𝐀𝐬𝐤 𝐀 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧" On Our Storefront Or In "𝐘𝐨𝐮𝐫 𝐎𝐫𝐝𝐞𝐫" Options Click The "𝐂𝐨𝐧𝐭𝐚𝐜𝐭 𝐒𝐞𝐥𝐥𝐞𝐫".We Are Committed To Resolving Any Situation In Which Our Product Does Not Meet Your Expectations.

SaleRank No. #3

NEPOWILL 40V 4.0Ah Replacement Battery for Kobalt 40v Battery MAX 2540C-06, Rechargeable Lithium Ion Battery for Kobalt KB640-03 KB540C-06 KB245-06 KB240-06 Kb540-06 for Cordless Power Tools

RECHANGEABLE POWER SOURCE - Rechargeable Lithium Ion Battery, Battery voltage - 40V, Battery wattage - 160Wh Battery capacity - 4000mAh, great alternative battery for Kobalt 40V Battery. Replacement Battery for Kobalt KB-540-06 KB440-06‎ KB240-06 KB2540C-06 KB640-03 etc. Closely mirror original battery in terms of fit, capacity, charging speed and overall compatibility.
FULLY COMPATIBLE WITH KOBALT - Replacement battery for Kobalt, use Top-A grade battery cell, repeate test to match the original Kobalt. Fully compatible with Kobalt 40V power tools: chain saws, leaf blower, lawn mower, string trimmer etc, and also compatible with Kobalt 40V chargers KRC60-06, KRC40-06 and KRC40-06.
LONG LASTING POWER: Powerful battery with high-capacity (4000mAh), provide 2X longer run time and stronger power than original Kobalt 40V battery. Fully charged battery work well for a long time, and without replacing battery frequently during work, improve work efficiency.
INTELLIGENT BATTERY SYSTEM - Built-in ECP smart protection chip for battery, protect against overcharge, over-discharge, overpower, overtemperature, overcurrent, short circuit. Kobalt replacement battery with 4 LED lights, easy to quickly check battery status. Battery with effective cooling function to prevent overheating, achieve worry-free use.
RELIABLE AND DURABLE- Advanced battery for Kobalt, made of premium material and smart chip, obtain the CE FCC PSE ROHS certified, tested by manufacturer to match OEM products safe to use. Replacement battery for Kobalt 40v battery, charged or discharged as needed without losing capacity and memory effect.

SaleRank No. #4

SABER 40-Volt 4.0Ah Battery Replacement for Kobalt 40V Outdoor Power Tools (4.0Ah)

KOBALT COMPATIBLE: This battery is fully compatible with the entire Kobalt 40 volt tool lineup including the Kobalt 40v mower, pole saw, string trimmer, leaf blower, hedge trimmer, and more. It can be charged with the original Kobalt 40V charger and is a replacement for all Kobalt 40V batteries (KB440-03 KB2540C-06 KB640-03 KB240-06 KB640-06 KB245-06 ‎KRC40-06 KB440C-06 KRC60 KRC40-06 KB240-06)
HIGH PERFORMANCE: Our 4.0 amp-hour 40V high capacity lithium-ion battery delivers fade-free power with no memory loss after charging. Up to 100% more runtime than the standard Kobalt 2.0 Ah 40-volt battery.
HIGH QUALITY: Saber Battery is a trusted battery brand and our team has decades of experience in the electronics industry. All products are designed, tested, and quality controlled in the USA. You can count on Saber for high-quality products and reliable performance.
MULTIPLE SAFETY PROTECTION: All our batteries are fitted with protection circuitry to prevent overheating, overcurrent, over-charging, and over-voltage - making the battery safer and prolonging life.
CUSTOMER SATISFACTION: If you're unhappy with this battery let us know and we'll make it right - our customer services team is located in the USA so expect a fast and clear response!

Rank No. #5

Nbatispy 40V 4.0Ah Replacement Battery for Kobalt 40V KB2540C-06 Lithium Ion Battery KB-540-06 KB440-06‎ KB240-06 KB2540C-06 KB640-03 Cordless Power Tool

BATTERY SPECIFICATION: Brand New, Type: Lithium-ion, Voltage: 40V Max, Capacity: 4000mAh, Watt: 160W, Pack: 1 Pack, Adequate capacity and top A grade li-ion cells provides longer runtime and stronger power, Long run battery has double the capacity of the 2.0-Ah Kobalt quick charge battery and provides extended run time.
PERFECT COMPATIBILITY: Replacement for 40V cordless tool such as 40V string trimmer, leaf blower, hedge trimmer, chainsaw and lawn mower etc. Replacement Battery for KPM1040A-03, KM-1640-06,KM 4040-06,KM1940-07 KB440
UPGRADED FUEL GAUGE: Designed with 4 LED fuel gauges to monitor battery usage. There is no memory effect, and the battery can be charged or discharged as needed without losing capacity. It has overcharging protection, overheating protection, overload protection, short-circuit protection and etc... function, Make your work more safety.
LONG LASTING BATTERY LIFE: With an extended battery life, you can tackle your projects without interruptions, ensuring maximum productivity. Crafted with high-quality materials, our 40V Max Battery for Kobalt is built to last, delivering consistent power output over its lifespan.
WHAT YOU WILL GET: 1 pack 40V Max Battery for Kobalt, Manual. 24 x 7 E-mail Support, 12 Months warranty. Amazon return windows will close after one month, don ’t worry about it, you can click on seller store on right corner “ask a question”.Any problem please feel free to contact us.We are happy to help you!

Rank No. #6

【Upgrade】 CaliHutt 40V 6.0Ah Replacement Battery for Kobalt 40V MAX 2540C-06 High Capacity Lithium-ion Battery KB440-03 KB2540C-06 KB640-03 KB240-06 for Cordless Power Tools

✔ 【Powerful & 3x Longer Runtime】Specs: 40V 6.0Ah Lithium-ion | More than just a replacement! Actual capacity and top grade A-level lithium-ion cells provide longer runtime and more power than the OEM battery. (You can complete many tasks after a full charge.)
✔ 【Wide Compatibility & Seamless Fit】100% compatible with all original Kobalt 40V chargers KRC60-06, KRC40-06, KRC40-06 Kobatl 40V batteries KB440-03 KB2540C-06 KB640-03 KB640-06 KB245-06 JewKRC40-06 KB440C-06 KRC60 KRC40-06 KB240-06... - Kobalt 40V power tools.
✔ 【Extended Lifespan】With 1000 charging cycles and 1% low self-discharge rate, this TenHutt battery can work for up to 3 years without any issues. | Won't slow down your tools at the end of a charge.
✔ 【4 LED Indicators & Fast Charging】Faster charging speed. When you press the button, 4 LED indicators will display battery charging and usage level. | Won't slow down your tools at the end of a charge.
✔ 【Safety Protection | Intelligent ECP Circuit Protection】One of the few battery choices on the Craftsman replacement battery market, equipped with a Battery Management System (BMS) that can effectively protect the battery from potential damage caused by short-circuit, overcharge/discharge, overvoltage, and overheating.

SaleRank No. #7

Supowill KB2540C-06 40V Replacement for Kobalt 40V Battery 6.0Ah KB-540-06 KB440-06‎ KB240-06 KB2540C-06 KB640-03, Compatible with Kobalt Battery for 40V Cordless Power Tools

🏡[ Upgraded Battery for 4X Longer Runtime ]🌟: Type: Lithium-ion | Voltage: 40V | Capacity: 6000mAh | Watt: 240Wh (Offers 4X More Power than the Original Kobalt 40V 4.0Ah Battery, Makes Your Tools More Runing Time.) Lithium-ion battery for 40V Kobalt batteries delivers fade-free power with no memory loss after charging.
🎁[ Perfect Replacement For Kobalt 40V Battery ]🔌: 40V 6.0Ah Real Capacity Replacement Battery for Kobalt KB440-03 KB640-03 KB240-06 KB240C-06 KB640-06. 100% Compatible with Kobalt 40V Battery Chargers: KRC60-06 KRC40-06 KRC 840-03. Fit For All Kobalt 40V Tools. Makes Your Tools More Runing Time.
🔋[ Longevity Enhanced & Smart Ecp Protection ]👍: With a Recharge Cycle of 1000 Times and a Mere 1% Self-discharge Rate, The Supowill Replacement for Kobalt 40V Battery Ensures Flawless Operation for Up to 5 Years. Enhanced by a Battery Management System (BMS), It Provides Effective Protection Against Potential Damage from Short Circuits, Overcharging/Discharging, Over-voltage, and Overheating.
👷[ Don't Buy Inferior or Uncertified Batteries ]🔐: Do not purchase low-quality batteries (unauthorized batteries), be cautious as batteries may turn into 'bombs.' Supowill all products are certified by 𝐔𝐋/𝐂𝐄/𝐂𝐄/𝐅𝐂𝐂/𝐏𝐒𝐄/𝐑𝐎𝐇𝐒/𝐈𝐒𝐎𝟗𝟎𝟎𝟏/𝐂𝐁/𝐌𝐒𝐃𝐒/𝐔𝐍𝟑𝟖.𝟑, Fully Certified,Guaranteed Safety.
📧[ 2 Year Free Full Refund Or Replacement Only, No Repair] 💝: If You Have Any Questions About The Replacement For Kobalt 40V Battery, You Can Click The "𝐀𝐬𝐤 𝐀 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧" On Our Storefront Or In "𝐘𝐨𝐮𝐫 𝐎𝐫𝐝𝐞𝐫" Options Click The "𝐂𝐨𝐧𝐭𝐚𝐜𝐭 𝐒𝐞𝐥𝐥𝐞𝐫".We Are Committed To Resolving Any Situation In Which Our Product Does Not Meet Your Expectations.

Rank No. #8

Batryuic 6500mAh 40V Power Tool Battery Compatible for Kobalt 40V MAX Battery 2540C-06 KB440-03 KB2540C-06 KB640-03, etc.

【Upgraded 6.5Ah Capacity】Battery Cell: A+ Level Li-ion Cell | Voltage: 40 Volt | Capacity: 6500mAh offer stronger power and extended working time than OEM battery. 🚩Note: A new battery must be fully charged before use. And it can be fully activated and achieve optimal performance after 2-3 cycles regular use.
【3+ Years Battery Life】Our battery adopts premium cells, which features low iner resistance and stable voltage. Combined with BMS circuit board and voltage blancing mechanism, Our battery can be safely used for 1000+ Cycles(inferior cells can only use 600 cycles), very durable to use several years.
【Wide Compatibility】100% compatible with Kobalt 40V Family of 45+ Tools: including string trimmer, chainsaw, leaf blower, cultivator, lawn mower, lawn edger, pole saw, and hedge trimmer. P/N: KCS 1040B-03, KCS 1040A-03, KEG 1040B-03, KLB 1040B-03, KLB 1040A-03, KSB 1040A-03, KMSS 1040A-03, KPM 1040A-03, KSPM 1040A-03, KPM 1040B-03, KPS 1040A-03, KST 1040A-03, KST 1040B-03, KMS 1040A-03, KST 2540-06, KHT 1040A-03, KHT 1040B-03 etc.
【Safety and Stability】A+ level Li-ion cells and Intelligent chip provide comprehensive protection during use: overcharges, over-discharge, over-current and overvoltage protection to ensure safety and extend battery life. Acquisition of CE FCC ROHS certificates.
【Buy Worry-free】We provide 30 days money back, 365 days free replacement, Please contact us via Amazon message for warranty information. We will try our best to promise you an enjoyable shopping experience. Welcome to share your feelings with us.

Rank No. #9

eJiasu Replacement for Kobalt 40V Battery: 6.0Ah Lithium ion Replace for 40 Volt Max Batteries KB-540-06 KB440-06‎ KB240-06 KB2540C-06 KB640-03 Cordless Power Tool Battery (Blue)

Replacement Battery for All Kobalt 40v Battery -- This 40 volt kobalt battery with a solid value in good design and engineering, kobalt battery 40v has 6AH capacity, wattage at 240Wh, support long-lasting performance and durability, 40v max kobalt battery great replace for all kobalt 40v batteries including KB440-03 KB2540C-06 KB640-03 KB240-06 KB640-06 KB245-06 ‎KRC40-06 KB440C-06 KRC60
Reliable Quality -- High quality battery cells integrated microchip protects the rechargeable battery replacement for kobalt batteries 40v and extends lifetime, kobalt battery leaf blower equipped with automatic overload cut-off, short-circuit and over-voltage protection, no memory effect, can be charged or discharged as needed without capacity reduction, the kobalt leaf blower battery easy meet your requirement
Widely Compatibility -- Kobalt 40 volt battery seamless fit for whole Kobalt 40-volt tools lineup including the Kobalt 40v chain saws, weed whacker, leaf blower, lawn mower(20 inch mower KM 2041B-06 KPM1040A-03, 16 inch mower KM-1640-06, please check your mower model before purchase), string trimmer, pole saw, hedge trimmer, etc... , prolonging tool run time, and 40v battery kobalt can be fast charged with all the original Kobalt 40V Chargers KRC60-06, KRC40-06 and KRC840-03
Visible Battery Power -- Replacement for kobalt 40 V lithium battery with smart 4 led fuel indicators to show the batterty charging status, and if in demand, press the button near the indicator LED to show how much power remains in the 40v kobalt battery replacement
What you get -- 1x kobalt 40v battery 6.0ah, replacement for kobalt 40v max battery with 30-days money back and One Year Exchange aftersales service. Any problem, please feel free to contact us. Please click the "Ask a question" on our storefront or in "YOUR ORDER" options click the "contact seller", we will give you the most satisfactory solution

SaleRank No. #10

DTK Replacement for Kobalt 40V Battery MAX 6000mAh KPM1040A-03, KM-1640-06, KM 4040-06,Cordless Power Tool Battery

[Battery specification] Voltage : 40V| Capacity : 6.0Ah | Wattage : 240Wh | 1 Pack | Type : Lithium-ion | battery replacement for Kobalt 40V Cordless Tool | Removable, Rechargeable & No Memory Effect.
[Perfect compatibility] Replacement for 40V cordless tool such as 40V string trimmer, leaf blower, hedge trimmer, chainsaw and lawn mower etc. Replacement Battery for KPM1040A-03, KM-1640-06,KM 4040-06.
[Remaining battery indicator LED] The batteries built with 4-LED Fuel Gauge System allows immediate feedback on state of charge. Fast charge with original 40V battery charger KRC60-06 / KRC40-06 / KRC 840-03
[Product advantages] Use high quality lithium cells to produce this battery, no memory effect, can be charged or discharged as needed without capacity reduction.Over-charging, over-discharging, over-current and over-heating protections are programed in the battery, Battery case is made of ABS+PC materials, it’s sturdy and fire resistant with good heat dissipation.All this to promise safety use
[What You Get, Customer Service]: 1 packs battery, Manual. 30-day money back and 12-month limited warranty. CONTACT US: Please contact through "Your Orders" tab in Amazon account (allow 24hrs for reply), we will give you the most satisfactory solution.

Last update on 2025-06-01 / Affiliate links / Images from Amazon Product Advertising API

How Do You Buy The Best Kobalt 40V 4.0 Ah Battery?

Do you get stressed out thinking about shopping for a great Kobalt 40V 4.0 Ah Battery? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Kobalt 40V 4.0 Ah Battery, which is why we have assembled a comprehensive list of the greatest Kobalt 40V 4.0 Ah Battery available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Kobalt 40V 4.0 Ah Battery that you consider buying. Your questions might include the following:

Is it worth buying an Kobalt 40V 4.0 Ah Battery?
What benefits are there with buying an Kobalt 40V 4.0 Ah Battery?
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Which Kobalt 40V 4.0 Ah Battery are good in the current market?
Where can you find information like this about Kobalt 40V 4.0 Ah Battery?

We’re convinced that you likely have far more questions than just these regarding Kobalt 40V 4.0 Ah Battery, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Kobalt 40V 4.0 Ah Battery, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Kobalt 40V 4.0 Ah Battery. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Kobalt 40V 4.0 Ah Battery buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Kobalt 40V 4.0 Ah Battery currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Kobalt 40V 4.0 Ah Battery has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Kobalt 40V 4.0 Ah Battery?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Kobalt 40V 4.0 Ah Battery.
Customer Ratings: Number ratings grade Kobalt 40V 4.0 Ah Battery objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Kobalt 40V 4.0 Ah Battery.
Product Quality: You don’t always get what you pay for with an Kobalt 40V 4.0 Ah Battery, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Kobalt 40V 4.0 Ah Battery is should be an indication of how long it will work out for you.

We always remember that maintaining Kobalt 40V 4.0 Ah Battery information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

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The Best Kobalt 40V 4.0 Ah Battery of 2022 – Reviews & Buying Guide

How Do You Buy The Best Kobalt 40V 4.0 Ah Battery?

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