We can ship accessories like headlamps and chargers to PO boxes; however, batteries cannot be shipped to PO boxes.

Yes. Call 855-MAX-LITH (855-629-5484) and a real person picks up — no phone maze. Millertech’s average answer time is about 10 seconds. The people on the phone know the batteries inside and out and give practical answers on the spot. Support is based in Ohio.

After Dakota Lithium’s 2026 ownership change, the new owner didn’t take on the earlier warranty obligations. Millertech can replace your Dakota batteries, and its team will help you find the right match for your boat. Every Sport Series battery comes with a 10-year, no-questions-asked warranty.

We offer a 10% discount on package deals listed on our website. For additional bulk or volume discounts, you would need a wholesale account with us. Retail customers without a wholesale account do not qualify for extra volume discounts beyond the 10% package deal discount.

We’ll provide a prepaid UPS shipping label for your return. Simply box up the battery, attach the label, and drop it off at a UPS location.

Every Sport Series battery has a 10-year warranty from the date of purchase. If it fails, Millertech will repair it or replace it with a battery of equal or greater value, free. Millertech pays shipping both ways: “It is our warranty; it is our cost; not yours.” The warranty page lists no exclusions, and you don’t need proof of purchase

A five-year guaranteed warranty, and it’s simple. If your battery stops working in the first five years, we’ll repair it or replace it with one of equal or greater value, free. We pay the shipping both ways. There are no exclusions, and you don’t need proof of purchase: if it’s Millertech, it’s covered. For warranty service, call 855-MAX-LITH or email [email protected].

Orders placed before noon Eastern time ship the same day.
Orders placed after noon ship the following business day.

In Ohio. Millertech designs, builds, tests and services its batteries at its 42,000 sq ft facility in Middlefield, Ohio. Cells and components are sourced to Millertech’s own specifications. Because service happens in-house, Millertech can diagnose, fix or replace a battery faster.

Right here at millertechenergy.com, or find a Millertech dealer near you on our Dealers Near Me page.

Use the dealer locator to find dealers within 10–500 miles of you. Millertech ships to more than 800 dealers across the country, plus locations in Canada and South America. You can also visit the showroom in Middlefield, Ohio. Online orders over $100 ship free, and orders placed by noon ET usually ship the same day

Our Support Team at 855-MAX-LITH (855-629-5484). We’re here Monday through Thursday 8:00 to 4:00 ET and Friday 8:00 to 3:00 ET. Our Support Team answers in about 10 seconds. At 11:30 we all break for lunch together, because a team that’s taken care of takes better care of you.

Yes, you’ll receive tracking information for your order. If you order on our website, tracking details are automatically emailed to you. If you place your order by phone, please request tracking information, and we’ll send it to you.

Check with your RV manufacturer, since each one sets its own rules about electrical changes. Your Millertech battery has its own coverage: every Sport Series battery carries a 10-year warranty, and we pay shipping both ways. (Warranty page)