Introducing the Honeywell RTC Battery, a reliable and efficient power source for your Real Time Clock (RTC) accessories. This battery, with the original art number 318-051-001, is manufactured by Honeywell and is perfectly compatible with the PM43 model. With a weight of 0kg, this battery is the ideal choice for keeping your RTC device running smoothly and accurately. Trust in Honeywell for all your RTC power needs.