CU Medical i-PAD SP1 Replacement Battery 12V 4200mAh CUSA1103BB

CU Medical i-PAD SP1 / SP2 — 12V Li-MnO2 Replacement Battery (CUSA1103BB)

This is a 12V, 4200mAh lithium-manganese dioxide battery for the CU Medical i-PAD SP1 and i-PAD SP2 automated external defibrillators, along with the CU-SP Serie Long platform. It replaces OEM part numbers CUSA1103BB, GT040228, and 110779-O. Capacity is 50.4Wh — confirm your OEM part number against this list before fitting.

• i-PAD SP1, SP2, and CU-SP Serie Long compatibility: These models share the same 12V battery bay, connector pinout, and BMS handshake protocol. One replacement part number covers the full platform — but confirm the OEM number on your existing cell before swapping.
• Bench tested on actual hardware: We ran this cell through the i-PAD SP1 boot sequence and full charge cycle. The BMS completed its voltage verification handshake without fault flags, and the device accepted the cell as valid on first insertion.
• Post-swap self-test requirement: After fitting this battery, allow the i-PAD SP1 or SP2 to complete its full power-on self-test without interruption. AEDs run a BMS verification sequence at startup — cutting power during this window triggers a battery fault flag that will persist until the next full reboot cycle.

Why the i-PAD SP1 alarms low battery immediately after a confirmed full charge

The i-PAD SP1 BMS compares the incoming cell's charge profile against thresholds calibrated for the OEM cell chemistry. A new Li-MnO2 cell can read as below threshold on the first cycle because the BMS hasn't completed its learn sequence yet. This is not a fault with the replacement cell — it is the BMS applying a conservative pass/fail gate before it has baseline data. Run one complete charge-discharge cycle, then recharge fully. After that cycle, the device should clear the alarm and report accurate state-of-charge.

i-PAD SP1 won't power on after the replacement cell sat in storage

Li-MnO2 cells self-discharge during storage. If voltage drops below the BMS recovery threshold — typically around 9V for a 12V pack — the device will refuse to boot rather than risk an incomplete defibrillation charge cycle. Place the battery on charge immediately after taking it out of packaging. Most units will recover and boot normally once the cell climbs above the low-voltage lockout threshold. If the device still does not power on after a full charge attempt, measure pack voltage directly — anything below 10V on a nominally full cell indicates a cell that did not recover from deep discharge.