Upgrade Your E-Z-GO Express S4 to Fleet LithiumReplace 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.
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