Converting a golf cart or electric forklift from lead-acid to LiFePO4 works well when three things match the vehicle: the pack voltage, the BMS current rating (it must cover the motor controller’s peak draw) and the charger profile. Get those right and you gain usable capacity, remove watering and acid maintenance, and allow opportunity charging. Get them wrong and the BMS will trip under load or the pack will never fully charge.

Key Takeaways

• A “48 V” LiFePO4 pack is usually 16S (51.2 V nominal). “72 V” packs are commonly 22–24S, depending on the controller’s voltage window.
• Size the BMS for the controller’s peak current, not the average. This is the most common conversion failure.
• LFP packs averaged $81/kWh in 2025, against $128/kWh for NMC (BloombergNEF), which is why LFP dominates vehicle conversions.
• In North America, UL 2580 covers batteries for ride-on forklifts and golf carts (UL Solutions).

Why LiFePO4 for Carts and Forklifts?

• More usable capacity: lead-acid lasts longest when regularly discharged only partway. LiFePO4 can use most of its rated capacity every cycle.
• Opportunity charging: short top-ups during breaks don’t harm LFP, so one pack can last a multi-shift day.
• No watering and no acid: less maintenance and no electrolyte spills.
• Stable voltage: the vehicle keeps full speed and lifting power until the pack is nearly empty.
• Thermal stability: LFP chemistry is more tolerant of abuse than NMC. See LiFePO4 vs NMC.

For a broader comparison, see lithium-ion vs lead-acid.

Step 1: Match the Voltage

Check the controller’s minimum and maximum input voltage against the LFP pack’s full-charge voltage (3.65 V per cell) and cut-off voltage. A fully charged 16S pack reaches 58.4 V. See 24V vs 48V vs 72V lithium batteries and the voltage and SOC chart.

Step 2: Size Capacity from Real Energy Use

Size the pack in kWh, not Ah:

1. Measure or estimate the energy used per shift or per round (kWh).
2. Add a margin for hills, heavy loads, cold weather and ageing (often 20–30%).
3. Pack Ah = required Wh ÷ nominal voltage.

Because LFP delivers more usable capacity, a lithium pack with a lower Ah rating can often replace a larger lead-acid bank. Base the size on measured use, not the old battery’s label.

Step 3: Match the BMS to the Controller

Motor controllers draw high current in short bursts when accelerating, climbing or lifting. The BMS must:

• Handle the controller’s peak current for the full duration of the peak, not only the continuous current
• Deal with regenerative braking current, if the vehicle has it
• Communicate with the vehicle or charger over CAN where supported, so the dashboard shows SOC
• Include pre-charge, so the controller’s capacitors don’t cause an inrush trip at switch-on

Read our BMS design and reliability article for why the BMS decides whether a conversion succeeds.

Step 4: Replace or Reprogram the Charger

Lead-acid chargers use absorption, float and equalization stages that don’t suit LFP. Equalization in particular can overcharge lithium cells. Use a charger with an LFP CC/CV profile, ideally one that talks to the BMS. See our battery charging guide.

Step 5: Keep Weight and Stability Right

This matters most for forklifts. The battery acts as part of the counterweight. A lighter lithium pack can change the truck’s load rating and stability. Lithium forklift trays often add ballast to match the weight on the nameplate. Always confirm with the truck manufacturer. Golf carts, on the other hand, gain range and put less wear on the suspension when they carry less weight.

Safety and Compliance

• Battery standard: UL 2580 for golf carts and ride-on forklifts in North America (see our certification guide).
• Forklift charging areas: OSHA 29 CFR 1910.178(g) sets requirements for battery charging and changing. OSHA has clarified that areas used only for charging, with no battery maintenance or electrolyte present, are not subject to 1910.178(g)(2) (OSHA).
• Street-legal carts: in the US, vehicles faster than 20 mph but no faster than 25 mph are low-speed vehicles under FMVSS No. 500. A conversion that raises top speed can change how the cart is classified.
• EU: LMT batteries and industrial batteries over 2 kWh need a battery passport from 18 February 2027 (Regulation (EU) 2023/1542).

Is the Conversion Worth It? Calculating ROI

Compare the total cost of ownership over the vehicle’s remaining life, not just the purchase price:

• Battery replacements avoided: LFP’s longer cycle life often means one lithium pack outlasts several lead-acid sets.
• Labour saved: no watering, equalization or battery changes between shifts.
• Energy saved: higher charge efficiency means less electricity per kWh delivered.
• Uptime gained: opportunity charging can remove the need for spare forklift batteries.

We look at these savings in more detail in how lithium batteries reduce operating costs.