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The batteries with the most energy are the ones in submarines. A typical submarine battery weighs 300 tons and uses lead-acid technology, like car batteries. Submarines normally have two main batteries that can be connected in parallel (group-down) for long endurance or in series (group up) for high speed.

The US Balao submarine in 945 had two batteries each of 126 cells, each one weighing 1650 pounds and producing 2.5 volts with a capacity of 5320 Ampere-hours.

The total weight of batteries in the submarine was 185 tons and the energy capacity was around 3 Megawatt-hours.

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11y ago

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