Mindray SP1 Patient Monitor Replacement Battery 7.4V 2600mAh

Mindray SP1 / BeneFusion VP3 Series — 7.4V Li-ion Replacement Battery (ICR18650-2S / 115-068528-00)

This 7.4V, 2600mAh (19.24Wh) Li-ion battery replaces the OEM cell in the Mindray SP1 patient monitor and its related clinical platforms. It fits the SP1, SP1 Syringe Pump, SK-801 EX, BeneFusion VP3, and eleven additional compatible models sharing the same voltage rail and connector standard. Capacity figures are taken directly from product data — not estimated from comparable cells.

• SP1 and BeneFusion platform compatibility: These models share a common 7.4V two-cell architecture and the same BMS handshake protocol. The connector pinout and charge-IC communication line are identical across the platform, so one cell SKU covers the full range without modification.
• Bench tested on actual hardware: We cycled this battery through the SP1's charge-management circuit and confirmed the BMS authenticated correctly, accepted a full charge without fault flags, and held voltage within the monitor's operating window under simulated clinical load.
• Post-installation self-test requirement: After fitting this battery, allow the SP1 to complete its full power-on self-test without interruption. The device runs BMS verification at startup — cutting power mid-sequence causes a false battery fault that persists until the next complete reboot.

SP1 low-battery alarm triggered immediately after a confirmed full charge

The SP1's BMS compares cell state-of-charge against a threshold calibrated for the OEM cell's discharge curve. A new replacement cell has not yet completed a full charge-discharge learn cycle, so the BMS may read the cell as below threshold even when the charge indicator shows full. This is not a fault in the battery — it is the BMS applying a conservative margin to an uncalibrated cell. Run one complete charge-discharge cycle on the device before treating any alarm as a genuine fault.

Device will not power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If this battery has been stored for several months, its resting voltage may have dropped below the SP1's BMS recovery threshold — typically around 6.0V for a 7.4V nominal two-cell pack. The BMS will refuse to engage below this threshold as a protection measure, and the device will show no response when the power button is pressed. Connect the battery to the SP1 on charge for at least 30 minutes before attempting to power on — the charge IC applies a low-rate pre-charge to bring the cell back above the recovery threshold before handing off to the main charge cycle.