Batteries & Charging

Charging times, battery types and how to tell when a battery is worn out. Find out how long your battery takes to charge, whether your charger is the right size, and what to buy.

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Battery Charging Time Calculator

Pick your battery, how full it is and your charger, and see how many hours it takes to charge, whether your charger is the right size, and what to buy.

  • Hours to charge any battery
  • Flooded, AGM and lithium
  • Plug-in, onboard, DC-to-DC or solar
  • Charger size check
Open the calculator
Example: a 100 Ah flooded battery from 50% to full on a 10 A charger
7.4 hours to charge
3.2 hfast bulk stage
4.2 hslow last 20%
5.6 hon a 20 A charger
Coming soon Lithium vs AGM Cost Over Time Calculator What each battery really costs per year once you count cycles, usable capacity and how long it lasts.

Guides

How Long Does It Take to Charge a Battery? The simple math for how long a deep-cycle battery takes to charge, why AGMs slow down at the end, and what size charger or solar panel gets you back out fast. Read the guide Battery Voltage Chart: How to Tell If a Deep-Cycle Battery Is Bad What your multimeter is really telling you about a 12 V deep-cycle battery, and how to tell a battery that just needs a charge from one that needs replacing. Read the guide Lithium vs AGM: Is a Lithium Battery Worth It? Usable power, weight, cost over time, cold weather and charging, and whether lithium pays off for the way you fish and camp. Read the guide
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Shop Products

Every pick here comes from a popular, trusted brand that anglers, campers and hunters already count on. Not sure what size you need? Run the calculators above first, and they’ll point you to the best fit for your setup.

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Popular, trusted brands Sized with our calculators Compared side by side
7 picks Lithium (LiFePO4) batteries Battle Born, Dakota Lithium, LiTime, Redodo and Renogy deep-cycle lithium. Compare and shop → 5 picks AGM deep-cycle batteries Mighty Max, Optima, Renogy, Universal Power Group and VMAX. Compare and shop → 5 picks Battery chargers Plug-in and onboard multi-bank chargers from Minn Kota, NOCO, ProMariner and Victron Energy. Compare and shop → 6 picks DC-to-DC chargers Charge a house or trolling battery while you drive: CTEK, LiTime, REDARC, Renogy and Victron Energy. Compare and shop → 4 picks Battery monitors Shunt monitors that show the real charge left, from Junctek, Renogy and Victron Energy. Compare and shop → 2 picks Battery boxes Vented boxes from Attwood and NOCO to protect and strap down your battery. Compare and shop →

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