Introduced is a VRLA battery (valve-regulated lead-acid battery) designed with a sealed case and pressure-relief valves. It is a kind of lead-acid rechargeable batteries. The pressure-relief valve activates when the battery is recharged at high voltage. The battery gives reduced gas ventilation and can be used in confined of badly ventilated spaces. It is applicable in small electrical appliances, power supply systems, mobile electronic devices, cameras, emergency lights and many more.