Fukuda DS5100 Monitor Replacement Battery 12V 3800mAh

Fukuda Monitor DS5100 Series — 12V Ni-MH Replacement Battery (10TH-2400A-WC1-1)

This is a 12V 3800mAh Ni-MH battery for the Fukuda Monitor DS5100, Denshi 5100 Monitor, and Denshi DS5100E Monitor — portable patient monitors used in clinical and ambulatory care settings. It replaces OEM parts 10TH-2400A-WC1-1, BATT/110354, EE090103, 10TH-3500A-WC1, and B11466. Capacity is 3800mAh (45.6Wh), matching the original power specification for these monitors.

• DS5100 / Denshi 5100 / DS5100E platform: All three models share the same 12V battery bay, connector pinout, and BMS handshake protocol. A single cell chemistry and pack format covers the full range — no variant sorting needed.
• Bench tested on actual hardware: We ran charge and discharge cycles on this cell under the DS5100 load profile. The BMS accepted the pack, completed its initialization sequence, and reported charge state correctly after the first full cycle.
• Power-on self-test handling: After installing this battery, let the monitor complete its full power-on self-test without interruption. The DS5100 runs BMS verification at startup — cutting power during this sequence triggers a false battery fault flag that persists until the next clean reboot.

DS5100 not completing boot sequence after battery swap

The DS5100 runs a BMS learn cycle during its first few boots with a new cell. If the monitor stalls or restarts mid-boot, the BMS has not yet calibrated to the new pack's internal resistance profile. Ni-MH cells fresh from storage present a slightly different impedance than a conditioned cell, which some medical-grade charge ICs flag as a fault. Run one full charge-discharge cycle before clinical use — this completes the BMS calibration and clears the boot hang.

Monitor alarming low battery immediately after a confirmed full charge

This happens because the DS5100's BMS applies a voltage threshold calibrated to the original OEM cell's discharge curve. A new replacement cell may read slightly below that threshold on the first few cycles until the cell is conditioned. It is not a faulty pack — it is the BMS treating an unconditioned cell conservatively. Run two full charge-discharge cycles outside of clinical use, then recheck. After conditioning, resting voltage should stabilise above the alarm threshold at approximately 13.2V fully charged.