They’re very water resistant, but they aren’t built to be submerged. Millertech Sport Series batteries are built with marine usage in mind. Yes, they are waterproof but not submersible or to be used in a direct spray of water for an extended period of time.

Yes, once you look at cost over the life of the battery and not just the price tag. How many cycles a Millertech LiFePO4 battery gives you depends on how deeply you drain it each time: up to 10,000 cycles at 30% depth of discharge (DoD), 7,000 at 50% and 5,000 at 80%. An AGM battery gets 600 to 800. Add a 10-year Sport Series warranty, and lithium costs less per trip than replacing lead-acid batteries every few seasons.

Millertech Sport Series batteries are built with marine use at the top of our minds. Yes, they're waterproof, but they aren't submersible, and they aren't made for direct spray over long periods. Every Millertech marine battery is sealed with a rubber gasket. The stainless-steel breather vent sits on top of the case, where rain and dirt can't collect, and lets air flow to prevent condensation. If your compartment floods, pump it out right away. If you have any doubts about your batteries afterward, call our Support Team at 855-MAX-LITH.

The batteries are very water resistant, with an estimated IP67 rating. This means they can handle rain, spray, and short-term exposure to water, like when washing a boat, but they are not fully waterproof. As long as they aren’t submerged or continuously sprayed for long periods, they should be fine.

Yes, with a Dual Purpose battery:
• 12V 135Ah and 190Ah: 1,500 cold cranking amps (CCA), rated for Mercury four-stroke engines up to 250hp
• 12V 100Ah: 1,000 CCA
• 12V 40Ah: 600 CCA

Yes, with enough battery and an inverter big enough to start it, but it takes a lot of power. A rooftop air conditioner often draws 1,000W to 1,800W while it runs, so one 12V 100Ah battery would run it for roughly an hour. RVers who want air conditioning off the grid usually build a larger battery bank, add solar, or run the generator for the hottest hours. Call our Support Team at 855-MAX-LITH and we’ll help you size it.

Yes. Keep a charged Max 8.0 and its hub in the house, and you can keep phones and tablets running when the power goes out. It’s also a quiet way to charge USB devices at an off-grid homestead, in a cabin or in a tiny home.

Yes.

Yes. It’s a good fit for barns, cabins, gates and job sites with no power nearby. Many security cameras need the Security Camera Adapter USB-C 5V (Item #1118-SEC), sold separately.

A standard Sport Series battery won’t take a charge below freezing. Built-in low-temperature charging protection stops it, which protects the cells. Store and charge it above freezing, or bring it inside the night before. If you charge on the boat in the cold, choose a heated model. Millertech offers several options that are heated.

Yes. It can charge from a solar panel while it powers your camera, using the Two-Way Splitter (Item #1117-SP), sold separately. Keep the solar panel's output at or below 12.6V and 5A (63W).

Yes. Make sure your solar charge controller is compatible with lithium.