The sealed TurboStart AGM Series 12 volt performance batteries utilize the latest state of the art AGM (Absorbent Glass Mat) separator technology. Because they can't leak, even if the container is damaged, it is fully charged so the battery is ready to go when you get it. The unique valve regulated design ensures that each cell operates at a slight positive pressure allowing the hydrogen and oxygen gas recombination process to occur within the battery which virtually eliminates on - charge gassing. No more maintenance and no more acid mess! TurboStart's 12 volt AGM performance batteries are built compact, yet they are powerful for racing and street rod applications. They feature maintenance free construction and can be mounted in any direction.