This battery is functional and safe. It is valve regulated which makes it nearly impossible to spill, and with its tightly sealed construction, it can be operated from any angle. With its hard plastic case, it can take severe amounts of high impact and not do any damage. It even has a low pressure safety release valve. This battery will last a long time both physically and chemically. Whether you need emergency lighting, or a long lasting cardiac pacemaker, this battery provides the power for medical care. They are relied and depended upon when you need them most. This listing is for one battery unit only; not sold in pairs.