RB40 12V LiFePO4 Lithium Deep Cycle | 40 AH
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion RB40 Lithium Battery
Relion Legacy Series

RB40 12V LiFePO4 Lithium Deep Cycle | 40 AH

Voltage: 12V

AH @ 20hr: 40

Energy (Wh): 512

R/C @ 25A: 96 min.

Depth of Discharge (DOD): 13000 Cycles @ 50% DOD

Terminal Type: M8

MBC #: LITH12-40

Dimensions In. (mm): 7.8 x 6.5 x 6.8 (198 x 165 x 172)

Weight Lb. (kg): 11.9 (5.4)

    Availability: Contact us

    Contact us for availability.

    Pickup Instructions
    Shipping & Returns
    Recycle & Save
    Product Information
    Pickup instructions
    Shipping & returns
    Recycle & save

    We supply convenient pickup locations in all major cities across Canada within 20 km of the city center. Proceed to checkout to select a location near you.

    We do not provide the full addresses online as our locations are exclusively for pickup. Upon ordering, you will receive the address in a pickup confirmation email. To schedule a pickup or for further information, please contact us.

    Canada Wide Pickup
    Our pickup locations are in London, Mississauga, Kingston, Ottawa, Sudbury, Thunder Bay, Montreal, Sherbrooke, Lévis (Quebec City), Moncton, Vancouver (Delta), Kelowna, Fort McMurray, Grand Prairie, Edmonton, Calgary, Saskatoon, Regina, Winnipeg and Halifax.

    Picking Up Your Order
    Our pickup locations are open Monday to Friday, 8am to 5pm and products are available for same day pickup, unless marked otherwise. Upon receiving your pickup email, we hold your product(s) for 5 business days and will have your order ready upon arrival during our regular business hours.

    Our warehouses provide convenience with bay doors and a helpful staff to facilitate your pickup. Please note that our locations are for pickup only and do not install or remove batteries from vehicles.

    We offer various shipping methods to accommodate your needs, including free business delivery, third-party shipping, free Canada wide shipping on select products and specialty carrier shipping to remote areas.

    Please note that products listed as "pickup only" are available for business delivery and third-party shipping. Contact a Voltloop representative on our toll-free number or by email to setup an account and receive a shipping quote.

    Free Business Delivery
    We supply free business delivery within a 100-kilometer radius of our facilities located in all major cities in Canada, including London, Mississauga, Kingston, Ottawa, Sudbury, Thunder Bay, Montreal, Sherbrooke, Lévis (Quebec City), Moncton, Vancouver (Delta), Kelowna, Fort McMurray, Grand Prairie, Edmonton, Calgary, Saskatoon, Regina, Winnipeg and Halifax. Contact us to setup an account and qualify today.

    Pickup Only Products
    Products marked as "pickup only" are not available for shipping through our online checkout. Please contact us to schedule business delivery or for specialty carrier delivery options.

    Returns, Refunds and Warranties
    Voltloop offers a 30-day return policy on select items, as well as full refunds for orders cancelled prior to processing, which normally takes one day. In addition, our products are backed by industry-leading manufacturer warranties, which are noted on each product page. For additional information, please see our terms and conditions.

    Specialty Carrier Shipping
    We provide specialty carrier shipping for remote locations with our nationwide distribution system. We have access to carriers and distribution points to facilitate delivery to any location in Canada and the United States. Please contact a Voltloop representative to receive a quote and shipping schedule.

    Third Party Delivery
    We offer third-party delivery options through UPS, FedEx, Canada Post, and USPS for orders shipped to Canada and the United States. At checkout, delivery times and pricing are calculated automatically. Products marked as "pickup only" are not available for shipping online, but please contact us and we can provide you with alternative delivery options and prices.

    Free Canada Wide Delivery
    We offer free Canada wide delivery on select products offered online. Product pages marked as "free shipping" will be available for $0 delivery at checkout with no prequalification necessary.

    No hidden core fees, plus we give you money back to recycle your old battery. All of our pickup locations are registered recycling depots, so when you pick up your new battery, we can recycle your old one and give you money back.

    Battery Exchange
    Battery scrap values depend on current market prices and vary based on size and chemistry. Prices are determined on location and are not subtracted from the original sale price.

    Batteries must be a minimum size to qualify for our money back program, with the approximate minimum size being a 35 lb. automotive battery. Please note that we do not remove or replace batteries in vehicles or equipment, and batteries must be removed before you proceed to our locations.

    This efficient and fast-charging 12V 40ah lithium battery is powerful yet compact enough to fit into many deep cycle applications. The RB40 is a lithium iron phosphate (LiFePO4) battery with more power, less weight, and up to 10x longer life than its lead-acid counterparts. Lithium is the logical choice for applications that will exhaust the batteries or run in extreme weather. RELiON lithium batteries provide more energy for high consumption than traditional lead-acid batteries. Lead-acid batteries also need to be maintained. If they are not maintained properly, their life span is shortened. Because lithium batteries require no active maintenance, a one-time purchase guarantees better lifetime value.

    The RB40 is suitable in many outdoor and recreation applications where lighter weight and capacity are key. It’s commonly used in the following applications: fishing electronics, robotics, solar lighting, remote power, outdoor adventures, and other deep cycle applications.

    Not all lithium batteries are created equal. All RELiON Batteries use the safest and most stable components, including a LiFePO4 cathode and a built-in Battery Management System (BMS). The BMS ensures a long lifetime, safe handling – and high-accuracy State of Charge (SOC) calculations.





    Nominal Voltage

    12.8 V

    Dimensions (L x W x H)

    7.8 x 6.5 x 6.8” 197 x 166 x 173 mm

    Nominal Capacity

    40 Ah


    11.9 lbs (5.4 kg)

    Capacity @ 25A

    96 min

    Terminal Type

    M8 x 1.25


    512 Wh

    Terminal Torque

    80 - 100 in-lbs (9 - 11 N-m)


    ≤50 mΩ @ 50% SOC

    Case Material




    Enclosure Protection


    Self Discharge

    <3% per Month

    Cell Type - Chemistry

    Cylindrical - LiFePO4​

    Maximum Modules in Series







    Maximum Continuous Discharge Current

    40 A

    Recommended Charge Current

    2 A - 20 A

    Peak Discharge Current

    80 A (7.5 s ±2.5 s)

    Maximum Charge Current

    40 A

    BMS Discharge Current Cut-Off

    170 A ±20 A (20 ±5 ms)

    Charge Current 32ºF to 14ºF (0 to -10 ºC)

    ≤0.1 C

    Recommended Low Voltage Disconnect

    11 V

    Charge Current -4ºF to 14ºF (-20 to -10 ºC)

    ≤0.05 C

    BMS Discharge Voltage Cut-Off

    8 V (2.0 ±0.08 vpc) (140 ±60 ms)

    Recommended Charge Voltage

    14.2 V - 14.6 V

    Reconnect Voltage

    10 V (2.5 ±0.1 vpc)

    BMS Charge Voltage Cut-Off

    15.2 V (3.8 ±0.025 vpc)

    Short Circuit Protection

    200-600 µs


    (1.1 ±0.4 s)



    Reconnect Voltage

    14.4 V (3.6 ±0.050 vpc)



    Balancing Voltage

    14.4 V (3.6 ±0.025 vpc)




    Discharge Temperature

    -4 to 140 ºF (-20 to 60 ºC)


    CE (battery)

    Charge Temperature*

    -4 to 113 ºF (-20 to 45 ºC)


    UN38.3 (battery)

    Storage Temperature

    23 to 95 ºF (-5 to 35 ºC)


    UL1642 & IEC62133 (cells)

    BMS High Temperature Cut-Off

    176 ºF (80 ºC)

    Shipping Classification

    UN 3480, CLASS 9

    Reconnect Temperature

    122 ºF (50 ºC)



    *Refer to charge currents below 0°C (32°F)




    Manufacturer Limited Warranty 3 Years Replacement or Repair Warranty with 10 Year Total Warranty.