How many amp hours is a marine battery？

Marine batteries come in various sizes and capacities, and their amp hours (Ah) can vary widely depending on their type and application. Here's a breakdown:

1. Starting Marine Batteries
   These are designed for high current output over a short period to start engines. Their capacity is not typically measured in amp hours but in cold cranking amps (CCA). However, they usually range from 50Ah to 100Ah.
2. Deep Cycle Marine Batteries
   Designed to provide a steady amount of current over a long period, these batteries are measured in amp hours. Common capacities include:
   • Small batteries: 50Ah to 75Ah
   • Medium batteries: 75Ah to 100Ah
   • Large batteries: 100Ah to 200Ah or more
3. Dual-Purpose Marine Batteries
   These combine some features of starting and deep-cycle batteries and typically range from 50Ah to 125Ah, depending on the size and model.

When selecting a marine battery, the required capacity depends on its usage, such as for trolling motors, onboard electronics, or backup power. Ensure you match the battery's capacity to your energy needs for optimal performance.