“Is lithium worth it?” depends on three numbers: what you’ll pay for each option, how long each lasts, and how much you drive. This calculator takes your own prices and usage and shows the real cost per year over ten years of ownership, including the electricity lead-acid wastes and the maintenance lithium doesn’t need, plus the year lithium pays for itself.
Lithium option
Lead-acid option
How you use the cart
| Over 10 years | Lead-acid | Lithium |
|---|---|---|
| Battery sets needed | … | … |
| Battery purchases | … | … |
| Maintenance | … | $0 |
| Electricity | … | … |
| Total 10-year cost | … | … |
| Cost per year | … | … |
How the Calculator Works
It models ten years of ownership for each option and adds up four things:
- Battery purchases. Sets needed in 10 years = 10 ÷ expected life, rounded up. A 5-year lead-acid set means two purchases; a 9-year lithium pack means two as well, but the second is bought in year 10, which is why the breakeven line matters more than the raw total.
- Maintenance. Lead-acid needs distilled water, terminal cleaning and equalization; the default $30 a year is conservative. Lithium needs none.
- Electricity. Your miles × the cart type's energy per mile gives kWh per year. Lead-acid charging is only about 75% efficient (the rest is lost as heat and gassing); lithium is about 95%. Same miles, different bills.
- Breakeven year. The first year in which the running total for lithium is at or below the running total for lead-acid.
Not included: resale value (lithium carts sell for more), weight (250–300 lb less on the cart, tires and suspension), consistent power on hills, and the hours you don't spend watering batteries. Every one of those favours lithium, so treat the calculator as the pessimistic case for lithium.
Where to Get Your Numbers
- Lithium kit price: a complete 48V 100Ah conversion with charger and reducer typically runs $850–$1,900. Full breakdown in Is a Lithium Conversion Worth It?. Current packs are compared in Best 48V and Best 36V.
- Lead-acid set price: six 8V name-brand batteries installed run $900–$1,400; budget sets $650–$900. Use a quote from your local dealer if you have one.
- Lead-acid life: 5 years if you water on schedule and never store it discharged; 3–4 if you don't. Be honest: most owners are in the 3–4 range.
- Lithium life: 9 years is conservative for a LiFePO4 pack rated 4,000+ cycles and warranted for 5–10; 12 is reasonable for light use.
- Electricity rate: your utility bill's per-kWh figure. The US average is around $0.16; California and the Northeast are higher, the Southeast lower.
Frequently Asked Questions
When is lead-acid actually the better choice?
Set the lithium price high, the lead-acid price low, and lead-acid life to 6 years, and lithium's advantage shrinks to a few hundred dollars over a decade. If you'll sell the cart within two years, or the current lead-acid set is under 18 months old, lead-acid wins on cash. Otherwise lithium usually does.
Why does the breakeven year matter more than the 10-year total?
Because you might not keep the cart ten years. If lithium is cheaper from year 4 onward and you plan to keep the cart six years, you're ahead. If breakeven is year 8 and you'll sell in year 5, you're not.
Does the calculator account for the lithium pack lasting into year 11+?
No. It stops at ten years and counts a second lithium purchase if the first pack's life is under ten. That's deliberately conservative. In practice a 9-year pack replaced in year 10 still has most of its life left when the window closes.
How much electricity does a golf cart use per year?
At 40 miles a week on a 4-seat cart, about 540 kWh a year from the wall with lead-acid and about 425 kWh with lithium, roughly $85 versus $70 at $0.16/kWh. Small money, but it adds up over a decade.
Next Steps
Numbers favour lithium? Confirm what fits your cart in the fitment guide, then size the pack with the range calculator.