Upgrade Your Star EV Sirius to Fleet Lithium Replace the factory lead-acid batteries in your Star EV Sirius with a single, high-performance 51V LiFePO4 pack from Fleet Lithium. Complete conversion kit — battery, charger, bracket, cables, and all hardware included. Choose Your Capacity Capacity Range Best For 51V 105Ah Up to 50 mi Daily driving, golf 51V 168Ah Up to 75 mi All-day use 51V 210Ah Up to 90 mi Max range, fleet use What's Included 51V NexGen Fleet Lithium LiFePO4 Battery (selected capacity) CH5618 — 58.4V 18A LiFePO4 Smart Charger BR7139 — Star EV Sirius Bracket Kit 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 Voltage Star EV Sirius 2 All Years 48V Star EV Sirius 2+2 All Years 48V Controller Compatibility Star EV Sirius models use a factory Curtis 48V AC controller. The Fleet Lithium 51V pack is fully compatible — no reprogramming or controller changes required. Will this fit my Star EV Sirius? Yes. The BR7139 bracket kit provides a factory-fit installation for all Sirius models. No modifications required. Does my controller need reprogramming? No. The factory Curtis 48V AC controller on Sirius models accepts the 51V lithium pack without changes. How long does installation take? 30–60 minutes with basic hand tools. Does it work in cold weather? Yes. 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.
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