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51V 105Ah Fleet Lithium Battery — NexGen BMS

$2,34900 USD
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10-Year Warranty US-Based Support Ships From The USA 30-Day Guarantee Safe Chemistry

51V 105Ah Fleet Lithium Battery — NexGen BMS

Drop-in 51.2V LiFePO4 replacement for tired 48V lead-acid banks. 5,376Wh of fade-free energy, half the weight of lead, and zero maintenance. Monitor state of charge, voltage, and cycle count via Bluetooth. Patent-pending fire suppression and a 300A NexGen BMS keep you running through every shift, round, and run.

What This Upgrade Fixes
  • Eliminates voltage sag and sluggish performance common in aging lead-acid setups
  • Cures range anxiety with consistent, fade-free power down to the last drop of capacity
  • Removes hundreds of pounds of dead weight, improving acceleration, handling, and braking
  • Ends the hassle of terminal corrosion, acid leaks, and seasonal battery watering
What's Included

1× 51.2V 105Ah Fleet Lithium Battery. Standalone bare battery unit. A 58.4V lithium charger, custom wiring, and mounting brackets are not included — see our Bundle and Conversion Kit listings for complete drop-in packages.

Compatibility

Universal 51.2V power unit engineered as a one-for-one replacement for 48V lead-acid battery banks. Drops directly into 48V golf carts, LSVs, UTVs, deep-cycle marine applications, and off-grid solar banks running factory 48V controllers — no reprogramming required for most vehicles.

Key Specs
  • Chemistry: LiFePO4
  • Nominal Voltage: 51.2V
  • Capacity: 105Ah (5,376 Wh / 5.38 kWh)
  • Cell Configuration: 16S1P
  • Working Voltage: 43.2V – 58.4V
  • Charging Voltage: 58.4V
  • BMS Voltage Cutoff: 43.2V
  • Recommended Low Voltage Disconnect: 49.0V
  • 300A NexGen BMS with 800A peak surge
  • Cycle Life: 5,000+ cycles at 80% DoD
  • Weight: ~104 lbs (47.3 kg)
  • Dimensions: 14.3" × 12.24" × 10.94"
  • Enclosure: Cold rolled steel, IP65
  • Operating Temp (Discharge): -20°C to 55°C (-4°F to 131°F)
  • Operating Temp (Charge): 0°C to 55°C (32°F to 131°F) — heater activates below 32°F
  • Communication: Bluetooth, GPS, RS485, UART, CAN
Frequently Asked Questions

Does this battery include a charger?

No — this listing is the bare battery only. You'll need a matched 58.4V LiFePO4 charger to run it.

Will this work in severe cold climates?

Yes. The NexGen BMS automatically activates internal heating below 32°F so the pack charges safely year-round.

How long will this battery actually last?

Engineered for over a decade of reliable performance and backed by our 10-year warranty.

Can I integrate this with a sophisticated motor controller?

Yes. The integrated BMS provides CANBUS and RS485 ports for advanced motor controllers and telemetry systems.

Is there a vehicle-specific kit with brackets?

Yes. If you're converting a specific golf cart (EZGO, Club Car, Yamaha, Advanced EV, etc.), our 48V Conversion Kits include this exact battery plus a model-specific bracket, charger, and all wiring — no fabrication required.

  • 5 stars: 6 (60%)
  • 4 stars: 3 (30%)
  • 3 stars: 1 (10%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
E
Eden B.
Useful monitoring and steady output — 51V 105Ah battery

The 51V 105Ah battery makes it easy to check the remaining charge without guessing from vehicle performance. Power remains smooth, and charging has fit easily into the normal routine.

Hi Eden, we're thrilled to hear that you're satisfied with the battery's performance and monitoring features! Thanks for sharing your experience.

S
Sofia M.
A dependable lithium upgrade — 51V 105Ah battery

The 51V 105Ah battery feels well built and has provided consistent power for repeated trips and daily use. The vehicle accelerates more cleanly and no longer needs the old battery maintenance routine.

E
Erica R.
Good performance with limited documentation — 51V 105Ah battery

The 51V 105Ah battery has worked reliably, but more application-specific installation notes would help first-time buyers. The battery output is steady and the reduction in maintenance is noticeable.

C
Charlotte G.
Impressive performance, slightly more setup than expected — 51V 105Ah battery

Getting the 51V 105Ah battery positioned and connected took longer than planned, but the battery itself has worked very well. The steady output and reduced maintenance are the biggest improvements.

N
Nina V.
Simple charging and predictable runtime — 51V 105Ah battery

The 51V 105Ah battery has made charging less of a guessing game because the remaining capacity is easier to track. Runtime has been consistent across several normal use cycles.

A
Amelia B.
Consistent power from the 51V 105Ah battery — 51V 105Ah battery

The 51V 105Ah battery holds power more evenly than the previous battery bank and feels stronger under normal load. Checking battery status is simple, and there is no routine watering or terminal cleanup.

H
Henry E.
Works well after sorting the installation details — 51V 105Ah battery

The 51V 105Ah battery met expectations, though the mounting and cable layout required more planning than anticipated. Once installed, it delivered stable power and has been easy to live with.

N
Nathan S.
Good battery with a careful first setup — 51V 105Ah battery

The 51V 105Ah battery performed well after the initial wiring and charging checks were completed. The setup took some attention, but everyday operation has been simple and dependable.

L
Layla N.
Well-built battery with a tidy installation — 51V 105Ah battery

The case, terminals, and connections on the 51V 105Ah battery feel substantial and the installed result looks clean. It has delivered steady power without requiring regular attention.

D
David C.
Cleaner battery compartment with the 51V 105Ah battery — 51V 105Ah battery

The 51V 105Ah battery replaced a crowded set of batteries with a much cleaner installation. The vehicle feels more responsive, and the lack of corrosion and watering is a welcome change.

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)
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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.

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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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Anonymous
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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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.

12V DC Voltage Reducer — 30A
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)
Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
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.

Fleet Lithium 51 Volt Battery Bundle for Polaris Ranger EV (2010–2024)
58.4V 18A On-board LiFePO4 Charger (CH5618)
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.

58.4V 18A On-board LiFePO4 Charger (CH5618)
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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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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Duplicate - EZGO TXT (2010-2021) (48V) Fleet Lithium Conversion Kit
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.

Duplicate - EZGO TXT (2010-2021) (48V) Fleet Lithium Conversion Kit

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