The Maplin Plus NP1.3-6 6V 1.3AH 20HR (AS 1.2AH) Sealed Lead Acid Rechargeable Battery is used in burglar alarms, portable power and many other applications. 

It can replace Yuasa NP1.2-6, Yucel Y1.2-6, and Power-Sonic ps612

Dimensions:

L: 98mm | W: 25mm | Ht: 56mm 

Weight: 0.3kg