Inovance Motor Absolute Encoder 3.6V Li-SOCl2 Replacement Battery

Inovance Motor Absolute Encoder — 3.6V Li-SOCl2 Replacement Battery

This 3.6V, 2600mAh lithium-thionyl chloride cell replaces the backup battery in Inovance motor absolute encoders. It maintains SRAM-based position memory when main power is removed, keeping absolute encoder data intact across power cycles in PLC automation systems. Dimensions are 64.90 × 28.60 × 21.00mm.

• Absolute encoder memory backup: Inovance absolute encoders store multi-turn position data in volatile SRAM. This cell provides the float voltage that keeps that memory alive when the drive is de-energised. Without it, the encoder loses its zero reference and the axis must be re-homed before the machine can run.
• Bench tested on actual hardware: We confirmed stable open-circuit voltage at 3.6V and verified the cell holds retention voltage under the low-microamp drain typical of encoder SRAM backup circuits. No BMS trip or impedance fault was flagged during the test cycle.
• Hot-swap protocol for Inovance encoder backup cells: Always replace this cell with the drive and PLC powered on and in RUN mode. Removing the old cell while the system is de-energised drops SRAM voltage immediately — position data is lost and a full encoder re-homing procedure will be required before the axis accepts move commands.

Why Inovance encoders lose absolute position after a battery swap

Absolute encoders use SRAM to store multi-turn count data. SRAM is volatile — it needs continuous voltage above roughly 2.0V to retain that data. The moment the backup cell is disconnected and the drive is unpowered, that voltage drops and the memory clears. The encoder reverts to an unknown position state, and the servo drive will typically throw an encoder error or home-lost fault on next power-up. The fix is always to swap the cell live, with the drive powered, so SRAM voltage never drops below the retention threshold.

New battery installed but the encoder battery alarm won't clear

Inovance servo drives do not auto-clear a battery alarm after a cell replacement — the fault flag stays latched in the drive's parameter memory until it is manually reset. Open the drive's programming software or front-panel menu, navigate to the fault or alarm reset function, and clear the active fault code. If the alarm returns immediately after reset, check cell voltage directly at the connector — a fresh Li-SOCl2 cell shipped in storage state may read as low as 3.4V and will rise to full rated voltage within a few hours on the drive's float charge circuit.