Dimeq EK606 Medical Device Replacement Battery 21.6V 3000mAh

Dimeq EK606 — 21.6V Ni-MH Replacement Battery (120031)

This is a 21.6V, 3000mAh Ni-MH replacement battery for the Dimeq EK606 portable medical device. It matches the OEM part numbers 120031 and BATT/110031. Swap it in when the original cell no longer holds charge or fails the device's power-on self-test.

• EK606 platform fit: The EK606 uses a fixed 21.6V rail with a BMS that handshakes on connector polarity and thermistor signal. This cell matches that connector pinout and includes the NTC thermistor line the charge IC expects — without it, the device flags a battery fault and refuses to charge.
• Bench tested on actual hardware: We cycled this cell through the EK606's charge-discharge profile and confirmed the BMS accepted the thermistor handshake on first connection. Capacity tracked within 4% of rated 3000mAh after the second full cycle.
• Post-swap self-test requirement: After installation, allow the EK606 to complete its full power-on self-test without interruption. Cutting power during BMS verification locks in a false battery fault that persists until the next clean cold boot — it will alarm low battery even on a full cell.

EK606 charge indicator stalling below 100% on first charge

On a new Ni-MH cell, the EK606's charge IC applies a conservative current ceiling during the first charge cycle. It reads the cell's internal resistance as higher than a conditioned pack and backs off before reaching full termination voltage. This is not a fault — it is the charge controller protecting an uncharacterised cell. Run one complete charge-discharge cycle and the IC recalibrates; subsequent charges reach full capacity and terminate correctly at 21.6V.

EK606 will not power on after replacement cell sat in storage

Ni-MH cells self-discharge at roughly 1–3% per day in storage. If this battery sat unshipped or unused for several weeks, its resting voltage may have dropped below the EK606's BMS recovery threshold — typically around 18V on a 21.6V pack. The BMS interprets this as a deeply discharged or faulty cell and blocks power-on to protect the circuit. Connect the device to mains power and leave it on charge for a minimum of 30 minutes before attempting to boot; most charge ICs include a trickle pre-charge stage that recovers cells above the hard-cutoff floor.