2 x Visonic 2XER18505M MCS-740 Siren Bell Box Batteries
This pair of replacement 2XER18505M batteries are perfect for the Visionic PowerMax MCS-740 wireless outdoor siren or bell box. These lithium 3.6V 3.5Ah are fitted in pairs. Every few years these non-rechargeable batteries simply come to the end of their natural life and therefore need replacing. The 3.6V Lithium 2XER18505M battery packs come with the four wires and the correct connector plug to it first time every time.