The Francis Signal Lamp Battery comes in 12v and suits the FSP127 Aldis Lamp. Suitable for SOLAS requirements. The battery is portable so it can be used in the event of an emergency onboard large vessels. Portable Aldis Lamp Battery as under Francis part no: C20175-01. As per SOLAS requirements, each signaling lantern should be supplied with 3 spare bulbs and a portable battery pack.