Divide the battery's amp hours (Ah) by the charger's amps. A 100Ah battery takes 10 hours to charge from empty with a 10A charger, or five hours with a 20A charger.

Divide your battery's amp hours (Ah) by your charger's amps. A 100Ah battery takes 10 hours to charge from empty with a 10A charger, or five hours with a 20A charger.

Millertech LiFePO4 is rated for more than 3,000 cycles and a calendar life of at least 10 years. The Sport Series warranty covers the same 10 years.

Start with the energy it holds. Our 12V 100Ah Sport Series battery (12100G24) is a 12.8V battery, so it stores about 1,280 watt-hours (Wh), and you can use nearly all of it. Divide that by the watts you’re running to get hours. For example, 50W of lights, fans and a water pump running together would take about 25 hours to empty it. Running through an inverter costs some extra power, so plan a little short of the math.

Six months plus on a single charge, depending on your camera model and how you use it. Cellular cameras, video, burst mode and night shots with infrared all use more power, so a busy camera will need a charge sooner than a camera taking single daytime photos. The Max 8.0 is rated for up to 30,000 photos.

Up to eight on the Max 8.0 hub (four USB-A and four USB-C) and up to four on the Max 4.0 hub (two of each). That’s enough to keep the whole group’s phones charged at camp.

The Max 8.0 gives you roughly 15 to 20 full charges for a typical smartphone, or four to five for a mid-size laptop. The Max 4.0 gives you about half that. Those numbers assume a completely dead device charged all the way to full.

About 30,000 trail camera photos with the Max 8.0 and about 15,000 with the Max 4.0. Your count will vary with camera model, settings and temperature.

More than 2,000 times. Recharge it every few months for your trail camera and it’ll be around for a lot of hunting seasons. It has a Millertech 5 year No Hassle warranty!

About 10 years, and more than 3,000 charge cycles. A lead-acid battery usually lasts one to two years. That’s why every Sport Series battery carries a 10-year warranty.

About 10 years. Cycle life depends on how deeply you drain the battery each time: up to 10,000 cycles at 30% depth of discharge, 7,000 at 50% and 5,000 at 80%. A lead-acid battery usually lasts one to two years. That's why every Sport Series battery carries a 10-year warranty.

Much longer, and exactly how long depends on how deeply you drain the battery each time. That's called depth of discharge (DoD): how much of the battery's capacity you use before you recharge. A Millertech LiFePO4 battery is rated for:

• 30% DoD: 10,000 cycles
• 50% DoD: 7,000 cycles
• 80% DoD: 5,000 cycles

Lead-acid gets 150 to 300 cycles and usually lasts one to two years. And on every cycle, a Millertech battery delivers 100% of its rated capacity.