48V lithium golf cart conversion: what it costs and whether it pays
A lithium pack costs roughly twice a flooded set and lasts roughly twice as long, while weighing 300 lb less. The case for it is real but narrower than the sales pages suggest.
What you are actually replacing
A 48V cart on lead-acid carries six 8V batteries at about 63 lb each — around 380 lb of battery. A 48V 100Ah LiFePO4 pack weighs about 85-110 lb including its case and BMS. You remove roughly 270-300 lb from a vehicle that weighs about 1,000 lb. Owners notice it in acceleration, braking and tyre wear before they notice the range.
Cost, compared honestly
| Item | Flooded | LiFePO4 |
|---|---|---|
| Battery set | $700-1,100 | $1,200-2,500 |
| Charger | Usually already fitted | $150-400, chemistry-specific |
| Watering, terminals, corrosion care | An hour a month, plus consumables | None |
| Expected life | 4-6 years, less in heat | 8-12 years |
| Cost per year of service | $150-275 | $120-290 |
Read that last row twice. On the lower end of the lithium range it wins; on the upper end it merely matches a flooded set. The conversion justifies itself on weight, maintenance and usable capacity before it justifies itself on money.
The capacity question, in usable terms
Lead-acid delivers about half its rated capacity if you want a decent life; lithium delivers 80-90% without harm. So a 48V 100Ah lithium pack (4.8 kWh rated) gives roughly 4 kWh of usable energy, while a comparable lead-acid set gives about 2.5 kWh before you are damaging it. That is the source of the "double the range" claim — it is largely the same energy bought at a higher usable fraction, not a free lunch.
Real-world range depends on cart, terrain, tyre pressure and load. Ask the supplier for range at your cart's weight and do not accept a figure quoted for a flat, unladen test.
What to check before you buy
- Charger compatibility. A lead-acid charger will overcharge or refuse to charge lithium. Most kits bundle a matching charger — insist on it.
- BMS current rating. It must exceed your controller's peak draw, not just its continuous rating. A 200A BMS on a cart that peaks higher will trip under acceleration.
- Cold charging. LiFePO4 must not be charged below 0°C (32°F), and a decent BMS blocks it. If the cart lives somewhere cold and you charge in an unheated shed, plan for heated storage.
- Mounting and ventilation. Lithium does not need the acid containment of a lead-acid bay, but it does need secure mounting and airflow.
- Gauge and wiring. Some conversions need a different state-of-charge gauge, because a lithium pack holds voltage flatter and the old bar display lies.
The verdict
Convert if you keep the cart for the long haul, drive it daily, and either hate maintenance or live somewhere hot where a lead-acid set dies young. Stay on lead-acid if the cart is a weekend toy, the pack is due and cash matters, or the cart itself is near the end of its life.
Related: golf cart battery guide · how long batteries last · LiFePO4 in practice