To understand a Tubular Battery, one must understand the how lead-acid battery is formed and the battery grid design.Battery Grid design is key to battery power and life, regardless of they are tubular or flat plate.Battery grids are supporting structure within the battery and give power to the lugs. In formation of battery, Half grids are covered in lead oxide to create negative plates and other half of the grids are covered in sponge lead to create positive plates.
The positive and Negative grids are placed together with separators between them to defend positive and negative plates from coming in contact with each other, and preventing internal short circuit. These grouped plates are then fitted into a battery cell and filled with liquid electrolyte. Individual battery cells are then placed inside a tray to form a battery. In Tubular Batteries , The battery grid is more of a comb like structure with tubes kept side by side while in flat plate battery, the grid is more of a squares like structures, together to form like a broad mouthed mesh.
Lead Acid Batteries are now in use for more than 150 years. With the advancement of technology, these batteries have also upgraded. In tubular the active material (Lead oxide) is placed inside the structure surrounding the grid combs, while in flat plate, the Lead oxide is pasted on the grid structure. Thus the external shape of the plate of tubular allows for easier movement of electrolyte resulting in fast charging, better thermal management(less heat), higher life expectancy, more life cycle and other benefits.