About this replacement
ZOLL SurePower II / Propaq M / X Series — 11.1V Li-ion Replacement Battery (8000-0580-01)
This 11.1V, 6450mAh (71.6Wh) Li-ion battery pack replaces OEM part 8000-0580-01 in the ZOLL SurePower II, Propaq M, Propaq MD, and X Series defibrillators. These are portable external defibrillators used in emergency medical response and clinical environments. Capacity figures come from the product data — not extrapolated from web sources.
- SurePower II, Propaq M/MD, and X Series compatibility: All four platforms share the same 11.1V three-cell Li-ion architecture, the same connector pinout, and the same BMS handshake protocol tied to OEM part 8000-0580-01. That shared electrical profile is why one pack covers all four models.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the X Series platform. The BMS completed its initialisation handshake without fault flags, and the charge IC accepted a full charge to spec voltage without triggering a chemistry-mismatch alarm.
- Post-installation self-test cycle: After fitting this battery, let the defibrillator complete its full power-on self-test without interruption. ZOLL devices run a BMS verification sequence at startup — cutting power during this step logs a false battery fault that stays latched until the next clean reboot.
Why the X Series and Propaq MD apply a conservative charge limit on the first cycle
ZOLL's charge IC applies a reduced current ceiling on cells it hasn't profiled before. On the first charge, the device measures internal resistance and adjusts the charge curve accordingly. This means the indicator may stop short of 100% on the initial cycle — it isn't a fault, it's the charge controller mapping the new cell. Run one full charge-discharge cycle and the indicator will reach full on the second charge.
Low-battery alarm triggers immediately after a confirmed full charge
This happens when the BMS compares the new cell's voltage profile against thresholds calibrated for a partially degraded OEM cell. A fresh cell can sit slightly outside the expected internal-resistance window on the first read, which the firmware interprets as a fault. The fix is to complete one full charge-discharge cycle so the BMS can recalibrate its state-of-charge estimation. After that cycle, the alarm threshold aligns and the low-battery warning clears at the correct voltage — typically around 10.5V under load.