Logisty S660-22e Replacement Battery 3.7V 90mAh Li-Polymer

Logisty S660-22e / BATLI11B — 3.7V Li-Polymer Replacement Battery (S660-22e)

This is a 3.7V, 90mAh Li-Polymer cell that replaces the original battery in the Logisty S660-22e wireless alarm system component. It also fits the D51-31, D5130GB, and D5131GB detectors in the Logisty-Diagral-Hager range. Dimensions are 21.10 × 12.00 × 5.30mm — measure your existing cell before ordering if you are unsure.

• S660-22e and D51-series compatibility: These detectors share the same battery bay geometry, 3.7V supply rail, and BMS handshake protocol. The S660-22e and BATLI11B part numbers reference the same physical cell spec, so one replacement covers the full model group listed above.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the alarm panel's float charge circuit. The BMS accepted the cell without fault codes, and the panel cleared its low-battery flag after the conditioning period completed.
• Post-installation float charge window: Do not run a zone diagnostic test immediately after fitting this cell. Allow 24–48 hours on float charge first. The panel's BMS needs that window to fully accept the new cell — triggering a test too early will cause a false low-battery report on the panel display.

Alarm panel showing low battery hours after installing new cell

This is a BMS acceptance issue, not a fault with the cell itself. The panel's charge controller checks cell voltage against an internal threshold before it clears the low-battery flag. A new Li-Polymer cell at shipping charge — typically around 3.6–3.75V — sits just below the threshold the panel expects at full float. Leave the panel powered with mains supply for 24–48 hours. Once the cell reaches full float voltage (3.7V nominal under load), the low-battery warning clears on its own.

Alarm losing stored programming after a mains power outage

If the panel drops its zone programming during a mains failure, the backup battery has not yet been fully accepted by the panel's charge circuit. A freshly fitted cell needs 48 hours of continuous mains-on float charging before it can sustain the panel's memory retention voltage during an outage. During that conditioning window, a power cut will cause the panel to lose RAM-stored settings. Keep mains power uninterrupted for the full 48 hours after fitting, then confirm the panel holds programming by briefly switching to battery-only supply.