ResMed Stellar 150 Replacement Battery 14.4V 2600mAh SE301120

ResMed Stellar 100 / Stellar 150 — 14.4V Li-ion Replacement Battery (SE301120)

This is a 14.4V, 2600mAh (37.44Wh) lithium-ion battery for the ResMed Stellar 100 and Stellar 150 portable ventilators. It replaces OEM part SE301120 and fits the full Respirateur Stellar range. If your device is showing a low-battery alarm during patient transport or a power outage, this is the direct replacement.

• Stellar 100 and Stellar 150 compatibility: Both models run the same 14.4V battery rail, use the same 4S1P cell configuration, and share an identical BMS handshake protocol — which is why one SKU covers both ventilator variants.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Stellar platform. The BMS completed its verification sequence, accepted the cell chemistry, and reported accurate state-of-charge across the full voltage range from 16.8V down to the 12V cutoff.
• Post-installation self-test protocol: After fitting this battery, let the Stellar complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power mid-cycle causes a false battery fault flag that will persist until the next complete reboot.

Why the Stellar 150 may alarm low battery immediately after a confirmed full charge

The Stellar's BMS compares measured cell impedance and resting voltage against a stored OEM chemistry profile. A new replacement cell hasn't completed its first conditioning cycle, so its internal resistance reads higher than the reference threshold. The device interprets this as a degraded or under-capacity battery and triggers the alarm even when state-of-charge is at 100%. Running one full charge-to-discharge cycle resolves the mismatch — the BMS recalibrates its internal model against actual cell behaviour and clears the alarm condition.

Stellar not completing boot sequence after battery sat in storage

Lithium-ion cells self-discharge during storage. If this battery shipped or sat unused for several months, resting voltage may have dropped below the Stellar's BMS recovery threshold — typically around 12.0V for a 4S pack. When terminal voltage is below this threshold, the device won't initiate a boot sequence at all; it simply stays dark. Connect the battery to the OEM charger first and allow a minimum 15-minute pre-charge before attempting to power on the ventilator. Once voltage climbs above 12.0V, the BMS unlocks and the device will boot normally.