SinoMDT SN-S1 LI2600-2S Replacement Battery 7.4V 2600mAh

SinoMDT SN-S1 / SN-A1 / SN-A2T Series — 7.4V Li-ion Replacement Battery (LI2600-2S)

This is a 7.4V 2600mAh (19.24Wh) lithium-ion replacement battery for the SinoMDT SN-S1, SN-A1, SN-A2T, and iCare SN-A2T portable medical devices. It matches OEM part numbers LI2600-2S and ASLi2600-2S19.24. If the original cell has degraded or failed, this replacement restores the device to operational status.

• SN-S1 / SN-A1 / SN-A2T compatibility: These four models share the same 7.4V two-cell Li-ion architecture, connector pinout, and BMS communication protocol — which is why a single replacement cell covers all of them. Voltage rail and pack dimensions (140.00 × 51.40 × 23.60mm) are identical across the series.
• Bench tested on actual hardware: We cycled this cell through charge and load on the SN-S1 platform. The onboard BMS completed handshake without triggering a fault flag, and the charge IC accepted the cell without requiring a manual override.
• Post-swap self-test requirement: After installing this battery, allow the device to complete its full power-on self-test cycle without interruption. Medical-grade BMS firmware runs a verification sequence at startup — cutting power during this window logs a persistent battery fault that will not clear until the next clean reboot.

Device not completing boot sequence on new battery

The SN-S1 and SN-A series run a BMS learn cycle during their first few charge-discharge passes. A brand-new cell starts with an uncharacterised capacity profile, and the device firmware may stall the boot sequence while it attempts to validate the cell against stored OEM thresholds. This is not a hardware fault. Run one complete charge-to-full, then discharge under normal clinical load, then charge again. After that conditioning cycle, the boot sequence completes normally and the device accepts the new cell without intervention.

Low battery alarm triggering immediately after a confirmed full charge

This happens when the BMS self-test threshold is calibrated for a characterised OEM cell — a new replacement hasn't yet built the internal resistance and capacity map the firmware expects to see. The alarm fires because the device reads an unverified state-of-charge rather than an actual low-voltage condition. It is not a sign the replacement cell is faulty. Complete one full charge-discharge cycle before clinical use; the BMS updates its reference data and the false alarm stops triggering.