How long do golf cart batteries last? Flooded, AGM and lithium

Flooded lead-acid golf cart batteries last four to six years. AGM lasts three to five. Lithium is warrantied for eight to eleven years depending on the brand and will probably outlast the cart it goes into. Those are the ranges owners and dealers report, and the spread inside each one is mostly about how the batteries were treated: watered or not, charged after every use or left half full, run to empty or turned around at half.

How long do golf cart batteries last is really two questions: how long should they, and how long will yours. The first is the table below. The second depends on the habits in the next section, and if you are about to replace a set, the batteries hub and the battery calculator will show whether the next set should be flooded or lithium for the way you drive.

Life by battery type

Type	Typical life	What the makers warranty	Cycles at 50 percent use
Flooded lead-acid (Trojan, Interstate, Crown, Duracell)	4 to 6 years	12 to 18 months free replacement	500 to 1,000
AGM lead-acid	3 to 5 years	12 to 24 months	400 to 800
Lithium iron phosphate (Eco, Epoch, RoyPow, Dakota, Allied)	8 to 10 or more	5 to 11 years	3,000 to 5,000

A few things stand out. The warranty on a flooded battery is a year or so, which is a sixth of its expected life; the makers are covering manufacturing defects, not wear. The lithium warranties are the life, and they come with cycle-count conditions written into them. And AGM, which costs more than flooded, does not last longer in a golf cart. It makes sense where you cannot water batteries, in an enclosed compartment or a cart that lives on its side in a trailer, and not otherwise.

Within flooded sets, 6V batteries tend to outlast 8V by about a year because they have thicker plates, and both outlast 12V golf cart batteries, which have the thinnest. The 6-volt and 8-volt pages explain why.

What shortens the life of a flooded set

Running low on water. Once the plates are exposed to air they oxidize and that part of the plate is gone for good. Check monthly, more often in summer, and fill with distilled water after charging to a quarter inch above the plates. This single habit is the difference between four years and six.

Leaving the pack partly charged. Lead sulfate forms on the plates every time the battery discharges and dissolves when it charges. Leave the battery half charged for a few weeks and the sulfate hardens into crystals that no longer dissolve. The capacity is gone. Plug the cart in every time it comes home and let the charger finish.

Running it down below half. A flooded battery that is used to 50 percent of capacity and recharged gives about twice the cycles of one run to 80 percent. Every trip that brings the cart home on the last bar costs you several ordinary trips.

Heat. A set in a Florida, Texas or Arizona garage ages about a year faster than the same set in Michigan. There is not much to do about it except keep the water up, which matters more when it is hot, and park in the shade.

Corrosion and loose terminals. White crust on a post adds resistance, which confuses the charger and starves the motor. Clean with baking soda and water, snug the nuts, and coat the terminals. The maintenance page has the full monthly routine, and the charging guide covers equalizing, which reverses mild sulfation if you do it before it hardens.

Mixing old and new. A new battery dropped into a three-year-old set gets pulled down to the level of the old ones within months. Replace one only in a set under about a year old.

What shortens the life of lithium

Not much, which is the point. Lithium iron phosphate does not sulfate, does not need water and does not mind sitting at half charge for the winter. Two things matter. Charging below freezing, which the BMS will block and which can damage cells if a charger forces it; a heated pack or an indoor charger solves that. And repeated BMS trips from a controller that pulls more than the BMS continuous rating, which is a sizing mistake rather than wear. The lithium overview covers both.

Signs a set is done

Range has dropped by a third or more from new, on the same route. The cart that did 18 holes and the ride home now needs the charger at the turn.

The cart is slow on hills it used to climb, or the lights dim when you accelerate. That is pack voltage sagging under load, which is tired plates.

The charger runs longer than it used to, or shuts off early. Either means the batteries are no longer taking a charge the way they did.

One battery is hot after charging, bulged, or smells of rotten eggs. Stop, disconnect the charger and replace it, and test the rest.

Rested voltage spread. An hour after a full charge, all six batteries should read within about 0.2 volts of each other. One that reads 0.3 or more below its neighbors is failing. The test guide walks through the multimeter, hydrometer and load test in about an hour.

When to replace, and with what

Replace a flooded set when two or more batteries fail a load test, or when the set is past four years and range has fallen off; at that point replacing one battery buys a season and no more. The cost guide has 2026 prices for each option.

Whether the next set should be flooded or lithium comes down to use. A cart driven a few times a week in a garage does fine on another flooded set at about half the price. A cart driven daily, parked for months at a time, or owned by someone who is done lifting 60-pound batteries is a lithium cart, and the calculator will show the break-even year with your own mileage. The fitment pages for Club Car, EZGO and Yamaha list which battery layout each model takes.