4V 450Ah Carbon Foam Firefly Oasis

$1,207.60 $966.08

4V 450Ah Carbon Foam AGM battery with exceptional performance under Partial State of Charge.

50 in stock

Discounts offered on bulk buys of 3+ and 12+ batteries!

Product Description

Firefly orders are non-refundable, any cancellations will be turned into store credit for use on other items. Orders are filled in order of arrival. Batteries come from Peoria, IL and may be shipped via palletized freight due to the weight of the battery. Delivery estimate is calculated at time of order and depends on the delivery location with a minimum estimate of 1-2 weeks from order to arrival. Clients will be responsible for any customs or duties that may occur.

Lithium-Ion Performance
Firefly’s award-winning technology improves upon lead-acid batteries with unmatched performance and lifespan in deep charge and discharge cycling. Carbon Foam shares most of Lithium-Ions benefits over traditional Lead-Acid batteries for less than half the price.

  • Long Life Cycle: 4925 Cycles at 50% DOD; 1475 Cycles at 80% DOD
  • Charges 30% faster than AGM batteries: Capture more of your solar generation and reduce fuel use because you won’t need to run your generator as long to charge your bank.
  • No offgassing: Safe for use in enclosed spaces in any orientation.
  • Lowest Cost Per Cycle over the Lifetime of the Battery compared to equivalent Deep-Cycle Batteries.
  • Two year shelf life.

The patented Microcell carbon foam design solves the leading causes of failure in lead-acid batteries by resisting sulfation and corrosion, making it a more reliable and longer lasting battery than any other lead-acid battery on the market.

The battery’s cells produce less localized corrosion and wear while utilizing active materials more effectively overall compared to a traditional cell. The long lifespan and low cost of the Carbon Foam batteries means every dollar stretches for the most cost-effective power storage available.

These batteries are best in their class for Kilowatt-Hour capacity, and with 100% Depth of Discharge, this powerful battery can compete with AGM batteries twice its size!

Partial State of Charge Resilience
The Carbon Foam battery can recover from partial state of charge abuse and extended storage in a discharged state without any loss of capacity.

These batteries are able to charge to 100% of their rated Amp-hour capacity even after weeks of battery abuse. They are able to operate for long periods of time in Partial State of Charge (PSOC) while still enjoying the most of their long life and high capacity.

Their excellent recovery from storage makes them the ideal battery for occasional excursions off-grid or for powering cabins which are only used for part of the year. Carbon Foam is the perfect solution for adventurers who are always on the move or for those who experience especially shady or rainy conditions. Fill up the batteries whenever the occasion strikes without losing any capacity.

Revolutionary Recharge
The Carbon Foam batteries are able to charge 30% faster than competing AGM batteries thanks to their improved technology. They can be charged at a boggling 200 Amps: ten times higher than average.

Field Tested
These batteries are non-gassing and require no maintenance, which make them the safer choice for marine and high temperature applications. Firefly’s Carbon Foam batteries are the well-tested superstars of the marine battery world.

Firefly Oasis vs Brand X
Learn more at Coastal Climate Control

In testing done by Rodd Collins of Compass Marine for Practical Sailor, the Firefly Oasis was the only AGM battery able to return to more than full capacity after a month of abuse in partial state of charge cycling.

Firefly Oasis PSOC Recharging
Learn more in the Practical Sailor

Another field test by Nigel Calder proved similar results after an even longer period of time.

“In preliminary testing I worked the Firefly batteries hard in a real-world (onboard, while cruising off the west coast of Scotland) partial state of charge operation. The goal was to minimize engine run times and optimize electrical system performance in an ‘off-the-grid’ situation with limited recharging opportunities. The kind of operating regime I followed spells death for most lead-acid batteries. In contrast, after two months of intensive cycling, the Firefly batteries tested out with 100% of the capacity with which they started. These are encouraging results which, if substantiated over longer periods of time, represent a ‘game changer’ in terms of lead-acid technology and boat electrical systems design. I look forward to collecting more data.”

–Nigel Calder

Learn More in Professional BoatBuilder

Firefly Oasis batteries are suitable for uses with RVs and trailers, marine applications, defense, mining, transportation and vehicles, and off-grid housing.

Note: Firefly batteries shipped to Canadian addresses and charged in CAD include brokerage and the 7% import duty. Shipping is not included and is quite variable. Email [email protected] for a ship quote for your quantity and delivery address. This must be shipped on a pallet ground freight. 

Note: Warranty on these batteries is from the manufacturer, Firefly Energy of Peoria, Illinois. Warranty is 3 years replacement, 3 years prorated. It is a PARTS ONLY warranty. You would be responsible for the shipping costs and 7% duty (if in Canada) and taxes (PST & GST) on the value of the replacement batteries from Peoria to your location. Azimuth Solar Products does not provide a warranty on these batteries and will not pay for shipping, duty, or tax on battery replacement.

Additional Information

Battery Type

VRLA AGM Gel with Microcell Carbon Foam

Nominal Capacity

450 Ah (1.8 kWh) @ 20 Hour

Nominal Voltage


Max Charge Current


Max Charge Voltage


Internal Resistance

1.1 mΩ

Depth of Discharge

100% DOD

Partial State of Charge Cycling Efficiency

Ah: >97%; Wh: >90%

Operational Temperature

-20⁰C to 50⁰C (-4⁰F to 122⁰F)

Storage Temperature

-30⁰C to 60⁰C (-22⁰F to 140⁰F)

Shelf Life @25⁰C (77⁰F)

2 Years

Self Discharge

< 3% per Month

Life Cycle

4925 Cycles at 50% DOD; 1475 Cycles at 80% DOD


25.8 x 17.4 x 43.8 cm (10.16 x 6.85 x 17.24")


44 kg (97 lbs )

Terminal Configuration

3/8 – 16 UNC




6 Years Renewable Energy (Solar, Wind, Etc;) or RV/Marine; 3 Years Engine Starting or Over the Road Truck Hotel/Night


Firefly International Energy Co.

Spec Sheet
Charging Recommendations
Battery Brochure
Manufacturer Warranty