Most Millertech marine batteries come in Group 24 or Group 31 cases:
• Group 24: 12V 100Ah Dual Purpose (heated and standard), 24V 50Ah
• Group 31: 12V 135Ah and 190Ah Dual Purpose, 24V 80Ah, 36V 50Ah and 60Ah
• Group U1: 12V 40Ah Dual Purpose
The 36V 105Ah measures 13.5 × 9.6 × 10.5 in and needs its own tray.

A heated battery has a built-in heater that turns on when the charger is connected and the temperature is below 32°F. It warms the cells to 34°F, then resumes charging. That lets you charge in the cold and fish down to 0°F. If you fish late fall, winter or early spring and keep the boat outside, it’s the one to get.

Heated Sport Series models:

• 12V 100Ah and 135Ah Dual Purpose
• 12V 300Ah
• 24V 80Ah
• 36V 60Ah

It’s a compact, rechargeable lithium battery pack, designed by Millertech, that powers your trail camera for months at a time so you’re not hiking in to swap AAs. Hang it on the tree next to the camera and plug it in. Add the slide-on USB hub and the same battery becomes a power station for phones, tablets and other USB gear at camp, on the boat or in the blind.

A lightweight, rechargeable lithium battery built to handle 2,000+ recharges. It comes with a Millertech 5 year No Hassle warranty!

A deep cycle battery delivers steady power over a long time, like a trolling motor needs. A Dual Purpose battery does that too, and it also has the cranking amps to start large marine engines. Use it as one battery for starting plus graphs and accessories.

Lithium iron phosphate (LiFePO4) is widely recognized as one of the most stable lithium chemistries. Lithium battery fires usually come from poorly designed, unregulated cells. Millertech uses Grade A prismatic cells built to its own specifications. LiFePO4 also has no lead or acid and gives off no gas while charging.

The Max 8.0 holds twice the energy and takes a bigger USB hub. The Max 4.0 is smaller and lighter to carry.

Millertech’s pro team includes some of the biggest names in bass fishing:
• Jacob Wheeler
• Kevin VanDam
• Greg Hackney
• Brent Ehrler
• Dustin Connell
• Nick LeBrun
• Justin Lucas
• Mark Zona
• Anthony Gagliardi
• Brent Chapman
• Jacob Powroznik
• Greg Vinson
• About a dozen more, listed on the partners page: https://millertechenergy.com/partners/

Pick the Max 8.0 if you want the longest time between trips to the tree, or you plan to charge several people’s phones and a laptop at camp. Pick the Max 4.0 if you’re running one camera, want something smaller in your pack, or you’ll only have a few devices to keep charged. Not sure? Call our Support Team at 855-MAX-LITH and tell us how you’ll use it.

Something is always on. Propane and carbon monoxide detectors, stereo memory and control boards draw a little power around the clock, and over weeks that adds up. Before storage, charge the battery fully, then flip the battery disconnect or remove the cables. A Millertech lithium battery loses only about 1% to 3% of its charge per month on its own, so once it’s disconnected it’ll be ready in spring.

It’s what’s inside, and what stands behind it. Millertech uses Grade A cells built to its own specifications. Its commercial-grade BMS is oversized by at least 20A. As Millertech puts it, “This, of course, costs us more.” A Sport Series battery also includes Bluetooth, the app, a marine-sealed case and the 10-year warranty. Amazon may offer cheap lithium, but that’s what you get. Cheaply made, and the suppliers are here today and gone tomorrow.

It works with most major trail camera brands that have an external power jack. Three DC barrel plugs come in the box:
• 5.5mm x 2.1mm: Stealth Cam, SpyPoint and Moultrie cameras
• 4.0mm x 1.7mm: Tactacam cameras
• 4.8mm x 1.7mm: Reconyx cameras
Lost a plug or need a spare? Each one is sold separately as Item #1121, #1120 and #1122. If you’re not sure which jack your camera has, call our Support Team at 855-MAX-LITH.