The world is facing human driven global warming which impacts our ocean. Large amount of data needs to be aquired to understand the rate of climate change. Presently, lithium ion batteries are used in underwater vehicles for data collection. Despite its high potential, it poses issue in being deployed in the depths of ocean as it cannot withstand high pressure. Seawater batteries are potential replacements for LIBs. They can be used in the depths of ocean in open or closed architecture with pressure equalised systems. The broad objective is to design aluminum based seawater battery that meets the requirements for AUV. The targets are long duration low current applications and short duration high current applications. Aluminum has low self-corrosion, but its protective oxide film impedes metal dissolution. This can be resolved by alloying the anode metal. Different Al alloys will be evaluated as critical anodes for SWB. Addressing the issue of cathode material sluggishness and reaction overpotential represents a formidable challenge. A cathode with suitable electrocatalyst that performs over wide range of temperature will be studied. It's possible that not all AUV kinds can have their needs met by open architecture SWBs. While alkali electrolytes can be used in closed architecture to achieve high power, self corrosion of the anode significantly increases. Corrosion inhibitors will be evaluted to minimise the parasitic losses at anode side in closed cell architecture.