HP 300PI Pagewriter Replacement Battery 6V 7000mAh SLA

HP 300PI Pagewriter — 6V Sealed Lead Acid Replacement Battery (M2460A)

This is a 6V 7000mAh sealed lead-acid battery for the HP 300PI Pagewriter portable electrocardiograph. It fits directly in place of OEM references M2460A, AS11013, B11013, and OM11013. The 300PI is a clinical-grade ECG device, so getting the voltage and chemistry match right matters before any patient examination.

• 300PI Pagewriter platform fit: The HP 300PI runs a 6V sealed lead-acid power rail with a BMS that verifies cell chemistry and internal resistance at startup. This battery matches that voltage rail and uses the same SLA chemistry the onboard charge circuit expects — mismatched chemistry triggers a persistent fault flag.
• Bench tested on actual hardware: We ran this cell through the 300PI's power-on self-test sequence and confirmed the BMS accepted the handshake on the first cycle. The charge circuit reached float stage without triggering a fault interrupt. Capacity held consistent with the rated 7000mAh across the test discharge.
• First-cycle self-test protocol: After installing this battery, allow the 300PI to complete its full power-on self-test without switching the unit off mid-sequence. The device runs a BMS verification routine at boot — cutting power during this window writes a battery fault to memory that persists until the next uninterrupted reboot cycle.

Device not completing boot sequence after battery swap

The 300PI Pagewriter runs a power-on diagnostic that checks battery voltage stability under a brief internal load. A new sealed lead-acid cell that has been in storage will show surface charge on the terminals but may not sustain the load test if the cell voltage has drifted below approximately 5.8V. The device interprets this as a battery failure and halts the boot sequence. Connect the device to mains power and allow a full charge cycle to complete before attempting to boot on battery alone.

Low battery alarm triggers immediately after a confirmed full charge

This happens because the 300PI's BMS compares internal resistance readings against a stored OEM baseline. A new cell has not yet formed its electrochemical plates fully, so internal resistance reads higher than the threshold on the first few cycles — the BMS flags this as a degraded battery rather than a new one. The alarm clears after one complete charge-discharge cycle that lets the BMS recalibrate its internal resistance reference. Run the device through one full clinical-off cycle before returning it to service.