How long do golf cart batteries actually last?
Four to six years is the brochure answer. In Florida, Arizona or south Texas it is closer to two and a half. Here is what separates the two cases, and how to tell when a pack is finished rather than merely tired.
The honest lifespan table
| Chemistry | Typical life | Cycles at sensible depth | Cost of a 48V set |
|---|---|---|---|
| Flooded lead-acid (6 × 8V) | 4-6 years | 500-700 to 50% DoD | $700-1,100 |
| AGM (sealed lead-acid) | 5-7 years | 500-700 to 50% DoD | $1,100-1,600 |
| LiFePO4 (48V pack) | 8-12 years | 3,000-5,000 to 80-100% DoD | $1,200-2,500 |
Those prices move with brand and season, and they exclude the charger — lithium needs its own, which is often bundled.
Heat is the variable that matters most
A lead-acid battery loses roughly half its service life for every 10°C (18°F) it sits above 25°C (77°F). A cart parked in a garage that reaches 35°C through a southern summer is living at half life before you drive it. That single fact explains why a Minnesota cart gets six years from the same pack a Miami cart kills in three.
Practical consequences: park in shade, avoid charging in the hottest part of the day, and never store a cart on a charger in a closed shed through August. If you are buying lithium partly for lifespan, note that LiFePO4 also dislikes sustained heat — the advantage is smaller in the subtropics than the spec sheet implies.
What actually kills a pack, in order
- Sitting discharged. Lead-acid left below about 50% state of charge sulphates, and the damage is permanent. Charge after every use, not every third use.
- Low water. Flooded cells need distilled water to just cover the plates — never above the vent well. Check monthly in summer. Exposed plates lose capacity immediately.
- Overcharging. A failing charger boils off water and cooks plates. If you are adding water every fortnight, test the charger before blaming the batteries.
- One weak cell in a series string. Six batteries in series carry the same current, so the weakest one drags the whole pack. This is why you replace the set, not the bad unit.
- Deep discharge cycles. Running to empty because the range is "still fine" costs you cycles you cannot buy back.
How to test whether yours are dead
Charge fully, then let the pack rest for a few hours. Measure each battery individually with a multimeter.
| Reading (per 8V battery, at rest) | Meaning |
|---|---|
| 8.4-8.5V | Healthy and fully charged |
| 8.2-8.3V | About 80%, usable |
| 8.0-8.1V | About 50%, weak |
| Below 7.8V | Failing — replace the set |
Then look at the spread. If one battery sits more than 0.15V below the others, it is the one choking the pack. A hydrometer reading on flooded cells should show 1.265 specific gravity when full; anything under 1.225 in a fully charged battery means sulphation.
Range is the other honest test. If you have lost more than about 30% of your original range, the pack is economically finished even if it still moves the cart.
When it is worth switching rather than replacing
If your cart is otherwise sound and you have replaced a lead-acid set twice in eight years, the lithium maths starts to win — see what a 48V conversion really costs. If the cart is old, the frame is tired and the controller is original, another lead-acid set is the cheaper way to keep it running.
Related: golf cart battery types and costs · testing, storage and recycling · runtime calculator