The MAXIMUM 40V 4.0Ah/20V 8.0Ah Battery provides robust power and flexibility for heavy-duty tasks. With a design built to support long hours, it efficiently handles demanding jobs, making it a reliable choice for professionals. Fully compatible across the MAXIMUM system, this battery seamlessly powers a range of tools, including saws, drills, and sanders. Constructed to endure challenging conditions, it’s ideal for jobsite applications where durability is key.

Delivers 4.0Ah runtime in the MAXIMUM 40V MAX platform for extended use
Provides 8.0Ah runtime in the MAXIMUM 20V MAX platform for high-demand tools
On-board battery indicator for convenient monitoring of charge status
Built for compatibility across MAXIMUM tools for versatile jobsite application
Rugged design to withstand challenging work conditions
Compatible with the MAXIMUM X-Volt 40V platform for high performance
2-year shelf life for dependable use and longevity
Advanced lithium-ion technology for long-lasting power and reliability

Part Number	6139
Accessories List	Instruction Manual
Battery Amp Hours (amp-hour)	4 Ah
Battery Platform	MAXIMUM X-Volt 40 V
Battery Technology	Lithium-Ion
Battery Voltage (V)	40V/20V
Battery/Charger Type	Battery
Batteries Included Quantity	1
Charge Time (min)	130 min
Consumer Pack Size	1

Shelf Life (year)	2 yr
Package Depth (in)	5.83 in
Package Height (in)	3.23 in
Package Width (in)	3.46 in
Package Weight (lb)	2.43 lb

Warranty

This product carries a special warranty. Please see your local Canadian Tire store for details.

Online Ordering

Pick Up is free at most stores (some stores require a minimum order value before tax)
Shipping fee is based on size and weight of products and distance from address to store
Same-Day Delivery costs $9.99 per order
Online Ordering Information

Returns

Most products can be returned or exchanged at any Canadian Tire store within 90 days of purchase
Some products are non-refundable and non-exchangeable
The return policy outlined above may not apply to the product you are currently viewing. For complete details and eligibility, please refer to our Return Policy for exceptions.

	Only Show Differences	Currently Viewing MAXIMUM 20V & 40V Fast Charger $59.99 price was $94.99	MAXIMUM 40V MAX Battery & Fast Charger Kit $129.99 price was $159.99	MAXIMUM X-Volt 40V 2.5Ah Li-Ion Battery $124.99	MAXIMUM 20V 2.0Ah Max Li-Ion Battery Pack $57.99
Ratings
Accessories List	Instruction Manual	Instruction Manual	Instruction Manual	Instruction Manual
Battery Platform	MAXIMUM X-Volt 40 V	MAXIMUM X-Volt 40 V	MAXIMUM X-Volt 40 V	MAXIMUM 20 V MAX
Battery Voltage (V)	40V/20V	40V/20V	40V/20V	18 V

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Reviews

Rating Snapshot

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9 reviews with 5 stars.

2 reviews with 4 stars.

0 reviews with 3 stars.

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0 reviews with 1 star.

Overall Rating

4.8

11 out of 11 (100%) reviewers recommend this product

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1 to 5 of 11 Reviews

1 – 5 of 11 Reviews

5 out of 5 stars.

Maximum 40V 4.0ah/20v 8Ah battery

6 months ago

The battery life lasts long, seems durable, and works well with other tools such as drills and sanders .

Yes, I recommend this product.

Helpful?

5 out of 5 stars.

Great battery

6 months ago

As advertised. It works well with my mastercraft tools. Battery holds a charge for a long time!

Yes, I recommend this product.

Helpful?

5 out of 5 stars.

Maximum battery

6 months ago

This battery by maximum is great. It charges very well and it works nice with my equipment.

Yes, I recommend this product.

Helpful?

5 out of 5 stars.

Maximum 40V 4.0Ah/ 20V 8.0A Battery

6 months ago

Very useful and convenient Easy to use and practical

Yes, I recommend this product.

Helpful?

5 out of 5 stars.

Pile rechargeable

6 months ago

Je viens de faire cet achat et jusqu’à présent ce petit appareil fait très bien le travail demandé. En plus, il est très compact et léger.

Translate with Google

Yes, I recommend this product.

Helpful?

1 – 5 of 11 Reviews

Next Reviews

Questions

1 - 2 of 2 Questions

Q: Will these batterys charge on the standerd 20v max charger?

a year ago

1 Answer

A: Unfortunately, no. The first generation 20V program chargers will not charge the 40V batteries as the 40V is a future technology innovation and was not available for consideration at time of the 20V charger development. The 40V chargers did take into consideration 20V battery charging requirements, basically a reverse technology investigation, and did build in both the 20V and 40V battery charging capability. Therefore, the 40V chargers are capable of charging all previously produced 20V batteries.
a year ago
Helpful?

Q: Is this product compatible with the Mastercraft 20 V tools, can I use it with that kind of tools?

2 years ago

1 Answer

A: No, these batteries are not compatible with Mastercraft 20V tools. You should be buying PWR POD batteries for MC items.
2 years ago
Helpful?

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^†Our Lowest Prices of the Year are defined as the period between January 1–December 31, 2025. Offer excludes localized promotions including but not limited to Grand Openings.

△The tire producer / manufacturer of the tires you are buying, and Canadian Tire is responsible for the recycling fee that is included in your invoice. The tire producer / manufacturer and Canadian Tire uses this fee to pay for the collection, transportation, and processing of used tires.

CANADIAN TIRE® and the CANADIAN TIRE Triangle Design are registered trade-marks of Canadian Tire Corporation, Limited.

^±Was price reflects the last national regular price this product was sold for.

**Online prices and sale effective dates may differ from those in-store and may vary by region. Dealers may sell for less.

* Financing available is “Equal payments, no interest” for 24 months (unless otherwise stated) and is only available on request, on approved credit and on purchases of $150 (unless otherwise stated) or more (Gift Cards excluded) made with your Triangle credit card at Canadian Tire, Sport Chek, Mark’s, L’Équipeur, Atmosphere, Sports Rousseau, Hockey Experts, L’Entrepôt du Hockey and participating Sports Experts. Interest does not accrue during the period of the plan. However, if we do not receive the full minimum due on a statement within 59 days of the date of that statement, or any event of default (other than a payment default) occurs under your Cardmember Agreement, all special payment plans on your account will terminate and (i) you will then be charged interest on the balances outstanding on such plans at the applicable regular annual rate from the day after the date of your next statement, and (ii) the balances outstanding will form part of the balance due on that statement. There is no administration fee charged for entering into a special payments plan. Each month during an equal payments plan you are required to pay in full by the due date that month’s equal payments plan instalment. Any unpaid portion not received by the due date will no longer form part of the equal payments plan and interest will accrue on that amount from the day after the date of your next statement at the applicable regular annual rate. Offer subject to change without notice.

Additional information for residents of Quebec only: The regular annual rate for persons applying for the Triangle Mastercard and the Triangle World Elite Mastercard is 21.99% for cash transactions and related fees and 21.99% for all other charges. Some applicants may receive a higher or lower regular annual rate depending on a credit evaluation. The minimum payment is the sum of (a) the greater of: (i) interest and fees shown on your statement + $10; or (ii) 5% of the New Balance, excluding amounts on special payment plans, (b) any balance over your credit limit, (c) any amounts past due not included in (b) above, and (d) the amount of any equal payments plan instalments then due. Balances under $10 are due in full. For residents of Quebec, the period between the statement date and the due date for payment is 26 days. The billing period covered by each statement can be from 28-33 days. The Triangle Mastercard and the Triangle World Elite Mastercard do not have an annual fee. Examples of borrowing costs (rounded to the nearest cent) assuming that all charges are purchases bearing interest at the regular annual rate of 21.99%, a 30 day month, no charges made on special payment plans and no other fees, additional payments or other changes are:

If your average balance is:	Total monthly credit charges will be:
$100	$1.81
$500	$9.04
$1000	$18.07
$2000	$36.15

^† In the form of electronic Canadian Tire Money® (CT Money®). You cannot collect paper Canadian Tire Money on bonus offers. Any bonus multiplier is based on the base rate of collecting CT Money. Not all items sold at Canadian Tire earn CT Money. The offered rate is exclusive of any bonus or promotional offers or redemption transactions. CT Money is collected on the pre-tax. Bonus CT Money collected from online orders will be applied to the member’s Triangle Rewards™ account within 5 weeks of the purchase date. Terms and Conditions apply. Visit Triangle Rewards: Sign Up & Earn Today for more information.

^®/TMMark’s is a registered trademark of Mark’sWork Warehouse Ltd, used under licence.

^®/TMSport Chek is a registered trademarkof FGL Sports Ltd, used under licence.

^◊Off our original prices. Pricing, selection, and availability of clearance items are determined by each store. Applicable on select styles/sizes. Clearance items may be display models or not exactly as shown. Quantities may be limited and may vary by store. Rainchecks unavailable. We reserve the right to limit quantities. Shop early for greatest selection. Contact your local store for more information.

^‡‡Shipping fees apply. Shipping fees and delivery times vary depending on location, size and weight of the item(s) and is only available within the province of the Canadian Tire retail location (“Store”) from which the item(s) was purchased. Bulk items will only be delivered within a 100km radius of the Store. Not available in Recontre East, NL. Conditions and restrictions apply. Visit Online Ordering for more information.

®/™ Mastercard, World Mastercard and World Elite are registered trademarks, and the circles design is a trademark of Mastercard International Incorporated.
®/TM Unless otherwise noted, all trademarks are owned by Canadian Tire Corporation, Limited and are used under license.
◊Off our original price. Quantities may vary by store. Some clearance product and price points may not be available at all locations.
± Was price reflects the last national regular price this product was sold for

®/™ Unless otherwise noted, all trademarks are owned by Canadian Tire Corporation, Limited.

*$9.99 + tax delivery fee. Select your store and enter postal code on the product page while shopping to determine if same day delivery is available. Products must meet certain cube/weight dimensions and distance from store must be less than 10km. For full terms/conditions, visit https://www.canadiantire.ca/en/customer-service/online-ordering.html

*Free at the majority of stores. Some stores may require a minimum order value (before taxes). Orders that do not meet the minimum order value will be subject to a fee. Orders ready typically within 24 hours. Wait for Ready for Pick Up email before proceeding to store. **$9.99 + tax delivery fee. Available at select stores. Select your store and enter postal code on the product page while shopping to determine if same day delivery is available. Orders placed before the cutoff time will be delivered the same day, and orders placed after cutoff time will arrive the next day. Eligible in-stock items only. Products must meet certain cube/weight dimensions and distance from store must be less than 10km. For full terms/conditions, visit https://www.canadiantire.ca/en/customer-service/online-ordering.html

®/TM Unless otherwise noted, all trademarks are owned by Canadian Tire Corporation, Limited and are used under license.

*Terms and conditions apply to collecting and redeeming. Visit triangle.com for full program rules. Ordinarily you are not able to collect Canadian Tire Money® (CT Money®) on that portion of a transaction in respect of which you redeemed CT Money, but can do so with this special offer. You may redeem for the full purchase price in CT Money to a maximum of $1,000 but bonus CT Money is calculated only on the pre-tax amount. Special offer not valid for Gift Card purchases. Pre-tax purchase. Bonus applied to maximum redemption of $1,000. No rainchecks.

†Our Lowest Prices of the Year are defined as the period between January 1–December 31, 2025. Offer excludes localized promotions including but not limited to Grand Openings.

*The Triangle Rewards Program is owned and operated by Canadian Tire Corporation, Limited. The Triangle® credit cards are issued by Canadian Tire Bank. Rewards are in the form of electronic Canadian Tire Money® (CT Money®). To collect bonus CT Money you must present a Triangle Rewards card/key fob, or use any approved Cardless method, at time of purchase or pay with a Triangle credit card. You cannot collect paper CT Money on bonus offers. Minimum $300 spend is on the pre-tax amount on the same tender and for a single transaction. $300 must be spent on items that earn CT Money. Not all items sold at Canadian Tire are eligible to earn CT Money or to be redeemed for. Conditions apply. Visit triangle.com for full program rules and Partner location information. The offered rate is exclusive of any bonus or promotional offers or redemption transactions. CT Money is collected on the pre-tax amount of the purchase. Bonus CT Money may take up to 5 weeks to be applied to the Member’s Triangle Rewards Account. No rainchecks. Single use only per Triangle Rewards Account.

* Offer begins at 12:00 a.m. Central Time (“CT”) on November 26, 2025 and ends at 11:59 p.m. CT on December 7, 2025 (“Promotion Period”). Valid only on qualifying purchases of 5-litre bottles of Pennzoil® Full Synthetic motor oil products made in-store at participating Canadian Tire retail locations in Canada or online at canadiantire.ca during the Promotion Period. Qualifying purchase must be made in one transaction. Void where prohibited or otherwise restricted by law. The total maximum rebate possible is $30 per person, household or address (e-mail and physical). All online submissions must be completed by 11:59 p.m. CT on December 22, 2025. An original printed retailer identified and dated purchase receipt showing the required qualifying Pennzoil® Full Synthetic motor oil purchase (brand and product required on receipt) during the Promotion Period must accompany all submissions. NOTE: For purchases made on a participating retailer’s online website, the purchase receipt (defined above), with the order confirmation/order number, as well as the shipping confirmation or final delivery/pick-up receipt is required. Submissions without this proof of purchase will be denied. Orders that are canceled and/or product returns are ineligible for this offer. Purchases by an installer for use in its business do not qualify for this offer. Bulk submissions or bundled submissions by retailers, or any other entity, on behalf of consumers, are not permitted. Case purchases of qualifying product in any pack size do not qualify for this offer. Shell Canada Products reserves the right to cancel, rescind, modify or extend this offer, in whole or in part, at any time without notice. Cannot be combined with any other Shell Canada Products promotion. Allow up to 8 weeks for mailing of your rebate if you choose to receive a physical check. Offer valid only in Canada. Other restrictions apply. To view a list of participating locations and full terms and conditions, please visit www.pennzoil.ca/rebate.
2 ”PayPal.com,” “PayPal.ca”, “PayPal,” and all logos related to the PayPal services are either trademarks or registered trademarks of PayPal or PayPal’s licensors. See the User Agreement at https://www.paypal.com/ca/webapps/mpp/ua/useragreement-full?locale.x=en_CA
3 Interac and Interac e-Transfer are registered trademarks and the Interac logo, InLife and InLife design are trademarks of Interac Corp. See Terms of Use at https://www.interac.ca/en/interac-e-transfer-terms-of-use/Pennzoil/Quaker State trademarks are owned by Pennzoil-Quaker State Company. Used under license.
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