Golf cart sat all summer and will not start: what is recoverable and what is not

Seasonal residents come back to Spring Hill in the fall and find the cart dead. Full-time residents park the cart in June because it is too hot to ride and find it dead in October. Both versions land on this page, and the question is the same: is the pack recoverable, or is it $1,200 to $1,800 for a new one? The honest answer depends on the state of charge when it went into storage, and the only way to know is a proper charge attempt followed by a load test. We do that before anyone buys batteries.

Check this first (fifteen minutes)

Read the pack voltage. A 48V pack at 40 volts or above has a real chance. A pack at 30 volts has been sitting flat for months and the odds are worse.
Try the charger and watch it. If it starts and runs, leave it. If it does nothing, the pack is probably below its start threshold, which is not the same as the charger being dead.
Pull a cell cap. Plates visible above the electrolyte means water was lost through the summer, and the exposed plate area is not coming back.
Look at the terminals. A summer in a damp garage grows crust. Clean it before drawing conclusions about the pack.
Check the tow/run switch and the tires. A cart that sat often has one flat tire and a switch somebody bumped while cleaning. Neither is a battery problem.

What is usually going on

What you observe	Likely cause	Fix and cost
Charger will not start, pack low but not flat	Below charger threshold	Bring-up on the visit, then load test
Charger starts, pack comes up, holds	Self-discharge only	Terminal service, tune-up $100 to $200
Pack comes up, collapses under load	Sulfation	Pack $1,200 to $1,800
One battery will not take charge	Failed cell	Single battery on a young pack, otherwise pack
Cart charges, clicks, will not move	Corroded cable or solenoid	See clicks but will not move
Tires flat, sidewalls cracked	Sat on hot concrete for months	Tires $75 to $150 each

Prices from the pricing page; the $50 to $100 service call comes off the repair.

Why a Hernando County summer is so hard on a parked cart

Two numbers from NOAA’s 1991 to 2020 normals for the Brooksville Chin Hill station explain it. The station counts 88.8 days a year at 90°F or above, with July and August highs averaging 90.6 and 90.4°F, and it records 30.24 inches of rain in June through September, about 58 percent of the annual 51.94.

Heat raises a lead-acid battery’s self-discharge rate, so a pack loses charge faster sitting in a hot garage than in a cool one. As the charge drops, lead sulfate crystals form on the plates; that is normal, and a charger reverses it if it happens soon. Left for months, the crystals harden and the charger cannot break them down. That is sulfation, and it is permanent capacity loss. Heat also evaporates water from the cells, and once the plates are exposed they sulfate in air. Meanwhile the humidity corrodes every terminal the pack has. A cart parked in May at 80 percent charge and collected in October has spent the hottest, wettest months of the year doing the worst thing a lead-acid pack can do.

Full-time residents are not exempt. Plenty of Spring Hill carts go into the garage when the afternoon storms start and do not come out until it cools off, which is the same storage window without the plane ticket.

The plan that prevents it

Charge to full before it sits, then top the water. A full pack self-discharges from a much better starting point.
Disconnect the main negative cable, or use a maintenance charger on a timer if the cart’s electronics tolerate it.
Have someone plug it in once a month. A neighbor, a house sitter, or a pre-booked tune-up visit mid-summer. One full charge a month keeps sulfation soft.
Coat the terminals before you leave. On the coast at Hernando Beach, where salt air off the canals is in the garage, this is not optional.
Consider lithium if this is the second or third dead pack. A lithium pack self-discharges slowly, does not sulfate, and comes back in the fall the way you left it. The battery replacement page has the comparison.

When the pack is finished

If the load test after a full charge attempt shows the pack collapsing, we say so with numbers, and you choose between lead-acid and lithium. What we will not do is sell a pack to a cart whose batteries came back fine, or try to recover a pack whose plates have been dry for four months. Either way you get the readings.

What to expect on the call

Tell us how long the cart sat, whether it was charged first, and what the pack reads now if you have a meter. We bring a charger capable of bringing a low pack up to the point a normal charger will take over, a load tester, and a pack on the truck if the description points that way. The battery cost calculator prices the worst case in advance.

Frequently Asked Questions

My cart sat while we were away and now it is dead. Can the batteries be saved?

Sometimes. A pack that was fully charged before it sat and has simply self-discharged often comes back. A pack that sat at partial charge through a Hernando County summer has sulfated, and sulfation is not fully reversible. Load testing after a proper charge attempt is what tells you, and it is worth doing before buying anything.

Why will my charger not start on a dead pack?

Most modern chargers require a minimum pack voltage before they will begin, which protects them from a shorted pack. Below that threshold they see nothing and refuse. A pack can sometimes be brought up enough to hand off to the charger, which is one of the things a service visit can do.

What does it cost if the pack is finished?

$1,200 to $1,800 for a lead-acid pack installed, $1,600 to $3,500 for lithium. If the pack recovers, you pay the $50 to $100 service call and whatever cleanup the cart needs, usually a terminal service and a tune-up at $100 to $200.

How do I stop this happening next year?

Charge fully before you leave, top the water, disconnect the main negative cable or use a maintenance charger on a timer, and have someone charge it once a month. A lithium pack removes most of the problem: it self-discharges slowly and does not sulfate.