About Fleet Lithium

Built for fleets that cannot afford downtime

Fleet Lithium engineers drop-in lithium power for golf carts, LSVs, marine, UTV and off-grid systems — verified fitment, real support, and warranty coverage behind every pack.

Warranty coverage
5,000+ cycle life
Ships from the USA
Verified fitment

Fleet Lithium is a leading provider of high-performance lithium-ion batteries designed for a wide range of applications, including marine, golf carts, RVs, solar power storage, and off-grid systems. Our batteries are known for their long lifespan, lightweight design, and low-maintenance needs, making them a superior alternative to traditional lead-acid batteries. At Fleet Lithium, we focus on delivering reliable, sustainable, and efficient energy solutions to our customers. Whether you're looking for batteries for your boat, solar energy system, or electric vehicle, Fleet Lithium offers a variety of products tailored to meet your specific energy needs.

Proof, not promises

How we back every pack

The claims below are the ones we can show you the paperwork for. Each links to the document, the tool or the desk that stands behind it.

10 years

Warranty on Promise series packs

Every Promise series pack carries a 10-year warranty, handled directly by us with same-day parts dispatch on approved claims. No third-party claim desk.

Warranty details

5,000+ cycles

Tested cell chemistry

LiFePO4 cells rated for 5,000+ cycles to 80% depth of discharge, paired with the NexGen BMS at 300A continuous and 800A peak surge discharge.

See the spec sheets

Verified fitment

Every kit mapped to a real vehicle

Bracket, cable and controller requirements are recorded per make, model and year, so the fitment verdict on a product page reflects an actual confirmed installation, not a guess.

Check your vehicle

Full documentation

Manuals, wiring diagrams, data sheets

Install guides, wiring diagrams and per-SKU data sheets are published for every pack and bundle, so your installer has the numbers before the cart is on the lift.

Document library

Direct support

Talk to people who know the packs

Support requests come back with a reference number and a real diagnostic walkthrough — no ticket maze. Warranty registration and claims run through the same desk.

Support center

Ships from the USA

Stocked domestically

Packs, brackets and chargers ship from US inventory, with restock dates published on the product page when an item is on backorder rather than hidden at checkout.

Shop the range

Need a hand?

Talk to a Fleet Lithium specialist

Not sure which pack fits your vehicle? Our team confirms fitment, voltage and charger requirements before you buy.