About this replacement
Simu GM1000 / GM800 Series — 9.6V Ni-MH Replacement Battery (9015168)
This is a 9.6V, 1300mAh Ni-MH replacement battery for Simu motorized roller blind and awning control systems. It fits the GM1000, GM800, and GM800H controllers. When the original cell depletes, this battery restores wireless operation so the motorized shade system can continue to respond to remote and hub commands.
- GM1000, GM800, and GM800H compatibility: All three controllers share the same 9.6V Ni-MH cell format, connector pinout, and BMS charge profile. Swapping between these models carries no voltage mismatch or handshake conflict.
- Bench tested on actual hardware: We ran this cell through the GM800's charge circuit and confirmed the BMS accepted the cell, completed a full charge cycle, and released load cleanly across the motor control circuit without thermal or voltage fault flags.
- Post-installation reconnect window: After fitting this battery, leave the controller powered for at least 60 seconds before sending any remote commands. Simu controllers run a mesh network re-join sequence after a power interruption — triggering the motor before re-join completes will cause the first command to be dropped.
Why the GM800 controller goes silent after a battery swap
Simu's GM-series controllers store their network pairing state in volatile memory that resets during a full power loss. When the original battery drains completely, that pairing data can be lost before the new cell goes in. The controller then boots as an unpaired device rather than rejoining the existing hub automatically. If the unit does not respond within 90 seconds of installing the new battery, open the Simu app and use the device pairing routine to re-register the controller to the hub.
Low battery alert triggering immediately after fitting a new cell
Ni-MH cells ship at a reduced storage voltage — typically around 8.5V to 9.0V — not at full charge. The GM1000's battery monitor compares resting voltage against a threshold set for a charged cell, so a fresh-from-packaging battery can trip the low battery alert straight away. This is a voltage reading issue, not a faulty cell. Allow the controller's internal charger to run for two to four hours, then check the alert status in the app — it should clear once cell voltage climbs above 9.2V.