All Yuasa EN & ENL, NP, NPC, NPH, NPL, NPW, RE, REC, REW, SWL, TEV, UXH, UXL and Yucel Series of Industrial VRLA Batteries have a date code for when the batteries were made which is usually stamped on the top of each battery. This date format only applies to industrial batteries (does not apply to automotive batteries such as car, motorcycle or leisure)

See example of date format below