Where to find battery for PG9901

Hello, I have a PG9901 siren and the battery needs replacing (see photo) but the only ones I see see online are 16000 mAh instead of 7000. Where can I find this battery?

Also, how can I stop the beeping at the control panel without deleting the device?

Thanks

DSC does not have a part number for a replacement battery.

From the manual, it uses Four 3.6V/3.5A/H Lithium independent cells
(EVE ER18505M) assembled in two plastic wrappings and connected to the cable adapter.)

https://cms.dsc.com/download.php?t=1&id=25771&_gl=1*1tt26k5*_gcl_aw*R0NMLjE3Njg0MTIzNjMuQ2p3S0NBaUFtcDNMQmhBa0Vpd0FKTTJKVUdjREdCekR5eXhZTjF6Sk03NlhNOFA0U3M4WmNsWi1fUXFhQUFZYzNGS2poYXNXSlc3ODl4b0NlSklRQXZEX0J3RQ.._gcl_auMTEzNDMxNTA1MS4xNzY4NDE5NTI4LjcwMDkxNTk2My4xNzcyMTk5MDM1LjE3NzIxOTkwMzU.

A quick search online yields the following result here but I could not speak for that specific product

Acknowledging the low battery alert from the main panel (Qolsys logo top right corner of home page, then Alerts/Alarms) should temporarily silence but the beep will return until the underlying issue is resolved.