About this replacement
SEDEA S5 / Elegant 10 — 3.7V Li-ion Replacement Battery (570919)
This is a 3.7V, 900mAh Li-ion cell (OEM part 570919) for the SEDEA S5 and Elegant 10 wireless alarm systems. It sits inside the alarm unit and powers motion detection, zone monitoring, and alert transmission. When the original cell degrades, this is the direct replacement.
- S5 and Elegant 10 compatibility: Both units share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — one cell covers both platforms without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the S5 platform. The panel BMS accepted the cell without fault codes, and charge current settled to float within the expected window.
- Post-install float charge window: Do not run a zone or siren test immediately after fitting this cell. The panel BMS requires the cell to reach full float charge — allow 24 to 48 hours on mains power before triggering any diagnostic test, or the panel may log a false low-battery event.
Alarm panel showing low battery hours after fitting the new cell
The SEDEA S5 panel does not simply read cell voltage — it monitors charge acceptance over time before clearing the low-battery flag. A freshly installed cell may sit below the panel's acceptance threshold for up to 48 hours. This is a BMS conditioning behaviour, not a sign of a faulty cell. Keep the system on mains power and the flag will clear once the cell reaches approximately 4.1V float.
Siren does not sound during test after battery swap
On the S5 platform, the siren output is gated during the initial charge stabilisation period after a cell swap. The panel holds the siren circuit inactive for 30 to 60 seconds to prevent a false trigger while the new cell settles. If the siren still does not sound after that window, check that the battery connector is fully seated and the cover is closed flush — a partial lid closure will generate a tamper fault that also suppresses the siren. Verify the panel shows no tamper event before running a second test.