Yamaha UMAX 2018-2026 48V Fleet Lithium Conversion Kit
Yamaha UMAX 2018-2026 48V Fleet Lithium Conversion Kit - 65Ah Backordered — estimated to ship Sep 15
10-Year Warranty Covered by Fleet LithiumCells, NexGen BMS, enclosure and workmanship — 5,000+ cycles at 80% DoD, US-based support.
What's covered
- Cells, integrated BMS, enclosure and internal wiring against defects in materials and workmanship.
- Capacity retention over the rated life — 5,000+ cycles at 80% depth of discharge.
- Replacement parts dispatched from our US warehouse, with US-based technical support.
Not covered
- Physical impact, submersion or water damage, and corrosion from improper installation.
- Charging with a non-lithium or mismatched charger.
- Unauthorized disassembly, modification or repair.
How to claim
- Register your product after delivery so coverage is on file.
- Contact our US support team with your order number and serial number.
- We diagnose with you and ship warranty parts — usually the same day.
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Yamaha UMAX 2018-2026 48V Fleet Lithium Conversion Kit
Drop-in lithium conversion kit for the Yamaha UMAX 2018-2026 48V system. Replaces the factory lead-acid battery pack with a purpose-built Fleet Lithium bundle sized for your vehicle's tray and electrical demands.
What's Included
- Fleet Lithium 48V battery pack — choose 65Ah, 105Ah, 168Ah, 210Ah
- Vehicle-specific bracket kit matched to the factory tray
- Matched lithium charger with OEM-style plug
- Hardware and wiring adapters required for installation
Fitment & Compatibility
- Vehicle: Yamaha UMAX 2018-2026 48V
- Factory battery config: Eight 6V Trojan T-105 flooded lead-acid batteries
- Vehicle class: UTV / Utility EV
Controller / Electrical Note: Use the factory voltage, battery layout and observable controller/charger labels shown in this branch. Stock controllers require no programming unless this row states otherwise; modified controllers need separate electrical review.
Modification Required: Ships with a vehicle-specific bracket kit, matched to your factory tray — no frame drilling required.
Fitment Notes: Match UMAX, the listed whole-year range, factory voltage, battery count and observable tray layout. Replace the lead-acid charger with the matched Fleet lithium charger.
Why Fleet Lithium
- 10-year warranty on Promise-series packs
- Bluetooth-enabled NexGen BMS with 300A continuous / 800A peak surge discharge
- Heated cold-weather operation and CAN/RS485 communication support
- Ships from the USA; shipping calculated at checkout
Quick answer: the Yamaha UMAX 2018-2026 48V Fleet Lithium Conversion Kit from Fleet Lithium has nominal voltage 51.2V, capacity 65 AH, continuous / peak discharge 300A continuous / 800A peak surge, cycle life 5,000+ cycles at 80% Depth of Discharge (DoD), cell chemistry Lithium iron phosphate (LiFePO4), warranty 10 Year Warranty. The complete specification table for this configuration is below.
Electrical & Performance
- Nominal Voltage
- Capacity
- Nominal Energy
- Continuous / Peak Discharge
- Charging Voltage
- Charging Current
- Discharge Cutoff Voltage
- Cycle Life
Battery & BMS
- Cell Chemistry
- Battery Type
- EV Battery Type
- BMS Features
- 300A Continuous / 800A Peak Surge Discharge , Advanced Battery Management System (BMS) , Internal Heating for Cold Temp Charging , Active Cell Balancing for Extended Life Cycle , Built in Fire Extinguisher for Ultimate Safety
- Safety Features
- Thermal Regulation (Heated Cells) , Low Voltage Disconnect (LVD) , Over Charge / Discharge Protection , Over Current Protection
- Battery Features
- EV Battery Features
- Operating Temperature
- Charging: 32 to 140 ºF (0 to 60 ºC) , Discharging: -4 to 149 ºF (-20 to 65 ºC) , Storage: 50 to 113 ºF (10 to 45 ºC)
Dimensions & Weight
- Dimensions (L x W x H)
- Weight
- 85.0 lb
Fitment & Compatibility
- Make
- Model
- Model Year
- 2018 , 2019 , 2020 , 2021 , 2022 , 2023 , 2024 , 2025 , 2026
- Model Number
Warranty & Compliance
- Warranty
- Certifications & Standards
- UL 1642, UL 1973, CE, RoHS, UN 38.3, IP67
- Condition
- Manufacturer Relationship
Product Details
- Classification
- Colour / Finish
- Vendor
- Fleet Lithium
- Product Type
- Lithium Battery Conversion Kit
- SKU
- KIT-YAMAHA-umax-48-65-UMX
Let customers speak for us
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
GREAT SERVICE
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!
The 12V voltage reducer corrected the unstable behavior that had affected the lights and other accessories. The output has remained steady through regular use.
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.
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.
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.
Easy installation and great technical support.
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.
Cabels look great. Will be installing them by the end of the week. Frank
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.
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.
The 76V replacement charger replaced the previous unit without requiring a complicated setup. Charging has been predictable, and the connector fits securely.
The plug on the 51V replacement charger seats firmly and the unit maintains a normal charging cycle. The battery has been ready for use each time charging is complete.
The parts for the EZGO RXV 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.
