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EZGO Express S4 / S4 HO (2012-2019) 48V Lithium Battery Conversion Kit — Fleet Lithium

$2,51943 USD
Shipping calculated at checkout.
10-Year Warranty US-Based Support Ships From The USA 30-Day Guarantee Safe Chemistry

Upgrade Your E-Z-GO Express S4 to Fleet Lithium

Replace the six 8V lead-acid batteries in your 48V E-Z-GO Express S4 or Express S4 High Output with a single 51V LiFePO4 pack from Fleet Lithium. Complete conversion kit — battery, charger, BR4480 bracket kit, cables and hardware included. Half the weight, twice the range, and no watering, ever.

Choose Your Capacity

Capacity Range Best For
51V 65Ah Up to 27 mi Stock carts only
51V 105Ah Up to 50 mi Daily driving, hauling
51V 168Ah Up to 75 mi All-day use
51V 210Ah Up to 90 mi Max range, fleet use

65Ah is for stock motors and controllers only. If your Express S4 carries cargo or has performance upgrades, choose 105Ah or higher.

What's Included

  • 51V NexGen Fleet Lithium LiFePO4 Battery (selected capacity)
  • CH5618 — 58.4V 18A LiFePO4 Smart Charger
  • BR4480 — Bracket Kit for E-Z-GO Express S4 / S6
  • AC0219 — AC Power Connector
  • CB0917 — Cable Set (35.4")
  • Digital State-of-Charge Gauge
  • All mounting hardware

Key Specs

  • 300A NexGen BMS with 800A peak surge
  • Patent-pending fire suppression system
  • Built-in cold-weather heater — activates automatically below 32°F (standard, not an add-on)
  • Bluetooth monitoring — voltage, temp, cycle count from your phone
  • 10-year warranty — designed and assembled in the USA

Fitment Guide

OEM Model Years Factory Pack Bracket Shipped
E-Z-GO Express S4 2012–2013 48V, six 8V lead-acid BR4480
E-Z-GO Express S4 2014–2019 48V, six 8V lead-acid BR4480
E-Z-GO Express S4 HO (High Output) 2014–2019 48V, six 8V lead-acid BR4480

Standard and High Output S4 carts use the same 48V lead-acid architecture and the same Fleet kit. Driving an Express S6? That model uses eight 6V batteries and has its own listing.

Controller Compatibility

The 48V Express S4 uses a Curtis / E-Z-GO DC SepEx controller (1206HB/PDS family on early carts, the 48V PDS/SepEx and High Output families from 2014). The Fleet Lithium 51V pack is compatible with all of them — no reprogramming, no controller upgrade, no wiring changes. Aftermarket controllers should be verified separately.

Will this fit my Express S4?

Yes, on any 48V six-8V Express S4 or S4 HO from 2012 through 2019. No drilling or vehicle modification is expected with BR4480 and the Fleet lithium charger.

Does it fit a 72V or ELiTE lithium Express?

No. The 2020-and-later 72V lead-acid and factory ELiTE lithium Express models use a different architecture and are not covered by this kit.

How long does installation take?

30–60 minutes with basic hand tools.

Does it work in cold weather?

Yes. The built-in heater activates automatically below 32°F — standard on every pack.

*Range estimates are maximums under ideal conditions (flat terrain, single rider, 12–15 mph, 70°F). Actual range varies with terrain, weight, speed, and temperature.

Let customers speak for us

from 460 reviews
BlueMax Marine 12V 105Ah LiFePO4 Battery (Group 24)
Colbyutahman
fantastic upgrade

What a fantastic upgrade from my old acid batteries. It was time and I’m so impressed. Shipping came smoothly. Customer service has been fantastic and looking forward to the adventures to come including camping, RV, fishing, boating.

BlueMax Marine 12V 105Ah LiFePO4 Battery (Group 24)
Bad Boy Recoil & Recoil iS Lithium Battery Conversion Kit (72V) | Fleet Lithium
Daniel L.
Amazing Product, Amazing Customer Service

The customer service and the battery itself from Fleet Lithium is unbeatable. One of the best experiences as a customer I have ever had. They stand by their product and help you every step of the way to ensure you are happy in your purchase. The install was easy once you know where everything is supposed to go and the battery has performed flawlessly in my Bad Boy Recoil since installation. It made it a lot lighter and the buggy is obviously quicker now and I was able to ride it around the farm for hours in fast mode the other day and only used 25% of the battery carrying a buddy and myself. It is really amazing.

Bad Boy Recoil & Recoil iS Lithium Battery Conversion Kit (72V) | Fleet Lithium
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Kevin l.
We're loving this!

Cannot thank these guys enough. Our Hunting buggy is a whole new animal of its own! The team did a great job answering questions, shipping took 3 days and i was even able to reach the support team at 4pm on a Saturday during install. Cannot thank them enough! Don't think twice, Fleet is the way to go for your lithium job.

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Corey F.
Was a slight hick up with the darn computer bot

Was a slight hick up with the darn computer bot. Once we got thru that the service and help with my change over was top notch.
Mt Ranger performance is awesome with the Fleet battery

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GREAT

GREAT SERVICE

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Randy E.
Awesome kit for cold weather climate

Awesome kit. We Live in a very cold climate, our ranger gets a ton of use year round and especially during the winter so the cold weather performance was a must for us. We've had the kit installed for about a year now and it's been perfect. Customer service has been super helpful the one or two times we had questions and we've got a couple of neighbors who run the kits as well and they say the same thing. Kevin and his crew are really top notch!

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12V DC Voltage Reducer — 30A
Carter A.
Solved inconsistent accessory voltage — 12V voltage reducer

The 12V voltage reducer corrected the unstable behavior that had affected the lights and other accessories. The output has remained steady through regular use.

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58.4V 18A On-board LiFePO4 Charger (CH5618)
Samantha S.
A practical spare or replacement — 51V replacement charger

The 51V replacement charger is easy to keep available as a backup and works without unnecessary controls. The battery reaches a complete charge consistently during normal use.

58.4V 18A On-board LiFePO4 Charger (CH5618)
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Claire Z.
Clean fit for the Polaris Ranger EV bundle — Polaris Ranger EV bundle

The Polaris Ranger EV bundle lined up well with the intended mounting area and the connections were easy to identify. Once installed, the vehicle felt smoother and more consistent through normal use.

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Cooper X.
Dependable charging from the 51V replacement charger — 51V replacement charger

The 51V replacement charger connected as expected and has charged the compatible battery consistently. The status indicators are easy to follow, and the unit feels solid in regular use.

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Lee L.
Easy installation and great technical support

Easy installation and great technical support.

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Owen F.
Responsive performance after installation — Club Car 48V kit

After installing the Club Car 48V kit, throttle response felt more immediate and the vehicle no longer felt sluggish late in the charge. The cleaner battery compartment is another welcome improvement.

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Frank K.
Cabels look great

Cabels look great. Will be installing them by the end of the week. Frank

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BlueMax Marine 12V 195Ah LiFePO4 Deep Cycle Battery (Group 27)
Parker A.
Reliable marine power from the BlueMax 200Ah marine battery — BlueMax 200Ah marine battery

The BlueMax 200Ah marine battery has provided steady power for onboard electronics and normal time on the water. It is easier to handle than the older battery and has required very little attention between trips.

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Erica X.
Straightforward upgrade with the EZGO TXT kit — EZGO TXT kit

The parts for the EZGO TXT kit were organized clearly and the installation sequence made sense. The finished setup looks tidy and removes the routine upkeep of the old battery bank.

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About Fleet Lithium

Built for demanding applications. Ready for everyday use.

Fleet Lithium develops high-output LiFePO4 battery systems for golf carts, LSVs, UTVs, marine, RV, and off-grid applications. We combine serious power capability with application-specific fitment, complete conversion components, and direct technical support.

Find My Battery Talk to Our Team

Why Fleet is in our name

Fleet Lithium was built around equipment that gets used hard and cannot afford unreliable power.

Fleet Lithium was built around equipment that gets used hard and cannot afford unreliable power. Government fleets, rental operators, farms, hunting properties, and utility vehicles were our proving ground—not the modified-cart trend.

Those demanding applications shaped our approach from the beginning: build batteries with the power, control, and durability required for heavy daily use. That same overbuilt approach now serves individual golf cart, LSV, UTV, boat, RV, and off-grid customers who simply want a system they can depend on.

More than a battery in a box

A successful lithium conversion takes more than matching voltage and amp-hours.

Battery output, controller demand, charger programming, mounting, cabling, vehicle electronics, and communication protocols all have to work together. Fleet Lithium develops complete systems around the application so customers and installers do not have to piece together a conversion and hope the components are compatible.

Depending on the application, a Fleet Lithium solution may include the battery, matched charger, mounting hardware, cables, gauge or display integration, programming, installation guidance, and direct technical support.

Power and control built into the system

Fleet Lithium’s current NexGen battery management platform is rated for 300 amps of continuous discharge and up to 800 amps of peak output. It is designed to support real controller demand without treating every short power surge as an overload.

Select Fleet Lithium systems also support features such as OEM CAN-bus integration, cold-weather charging automation, Bluetooth monitoring, and GPS or geofencing for fleet security and operational control. These capabilities are application-dependent—not included with every battery.

  • 300A continuous / 800A peak surge discharge
  • OEM CAN-bus integration on select systems
  • Cold-weather charging, Bluetooth, GPS/geofencing where applicable

The application matters as much as the voltage

Two vehicles can use the same nominal voltage and still require completely different batteries, mounting solutions, chargers, cables, programming, or controller considerations.

Fleet Lithium researches vehicle generations, battery compartments, electrical architecture, controller demand, and charging requirements to develop application-specific configurations. Where fitment or installation requirements are verified, we document them clearly. Where additional validation is still required, we do not present an assumption as a confirmed fit.

Support and Warranty

Support from people who understand the entire system

Our support does not stop at the battery terminals. We help customers work through the battery, BMS, charger, controller, vehicle wiring, programming, and installation as one connected system.

Customers have direct access to technical support, product specifications, installation information, troubleshooting resources, warranty registration, and claims assistance.

Fleet Lithium Promise Series packs are backed by a 10-year warranty.

Visit the Support Center
10 Year Promise Series warranty
USA Technical support

Built for the way you actually use it

Whether you manage a working fleet, operate equipment on a farm, hunt remote property, commute in an LSV, cruise in a golf cart, spend the day on the water, or need dependable off-grid power, Fleet Lithium is built around the application—not just the battery specification.

Find the Right Battery Contact Fleet Lithium