Logisty L5131 Replacement Battery 3.7V 90mAh Li-Polymer BatLi11

intercom Logisty L5131 / L5141 / L5142 — 3.7V Li-Polymer Replacement Battery (BatLi11)

This is a 3.7V, 90mAh Li-Polymer cell for the intercom Logisty wireless intercom units. It fits the L5131, D5131, L5141, and L5142 series, among others. The OEM part numbers are BatLi11 and MTU01X — verify either against your existing cell before ordering.

• Logisty L51xx series compatibility: These units share a common 3.7V Li-Polymer cell format, the same connector footprint, and the same BMS handshake protocol across the L5131, D5131, L5141, and L5142. One cell covers the full range.
• Bench tested on actual hardware: We ran this cell through charge acceptance and BMS handshake verification on the L5131 platform. The BMS accepted the replacement cell without fault codes, and float charge stabilised normally within the expected window.
• Post-installation charge hold: Do not run a zone or siren test immediately after fitting this cell. Allow 24–48 hours on the panel's float charge circuit first. The intercom unit's BMS needs that conditioning window before it will report a full charge state accurately — running a test before that point can trigger a false low-battery fault.

Alarm panel showing low battery hours after fitting the new cell

This is a BMS reporting behaviour, not a faulty cell. The Logisty panel measures battery state against a charge threshold — a freshly installed cell that hasn't completed float charging will sit below that threshold and trip the low-battery indicator. The panel needs 24–48 hours connected to mains before the BMS reports full. Once float charge completes, the alert should clear automatically without any panel reset.

Logisty unit losing saved programming during a mains outage after battery swap

If the replacement cell hasn't finished its conditioning cycle, it won't hold enough voltage to sustain panel memory during a mains dropout. The Logisty platform requires the backup cell to be above approximately 3.5V to maintain programming through a power interruption. A cell installed less than 48 hours earlier may not have reached that level yet. Let the unit charge fully on mains, confirm no low-battery warning is present, then test by briefly interrupting mains power.