Varta 6V 150mAh Medical Device Replacement Battery 5V150H

Varta 5V150H — 6V Ni-MH Replacement Battery for Medical Devices

This is a 6V 150mAh Ni-MH replacement cell for medical instruments and diagnostic equipment that use the Varta 5V150H cell format. It matches the original voltage and chemistry required by devices built around this part. Fits equipment referencing OEM part numbers including 5V150H, 5V150P, 5V110R, 5V100R, and 55615-305-052.

• Multi-OEM cross-reference compatibility: These part numbers — 5V100DK0, 5V100DKO, 5V110R, 5/110R, and 55615 — share the same 6V Ni-MH voltage rail, cell footprint (30 x 24.72 x 14.26 mm), and connector spec. The BMS in each device expects the same charge termination curve, which this cell satisfies.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a controlled bench setup. The BMS handshake completed correctly, charge termination triggered at expected voltage delta, and no false fault codes were generated after a full conditioning cycle.
• Post-installation self-test protocol: After fitting this cell, let the device complete its full power-on self-test without interruption. Medical device firmware runs BMS verification at startup — cutting power mid-sequence triggers a persistent false battery fault that will not clear until the next complete reboot.

Why a medical device alarms low battery with a freshly charged replacement

Medical device BMS firmware is calibrated to the internal resistance profile of a conditioned OEM cell. A new cell has a slightly different impedance signature, and some devices interpret this as low charge state, even after a full charge cycle. The alarm typically clears after one complete charge-discharge cycle, which lets the BMS learn the new cell's actual capacity curve. If the alarm persists beyond two full cycles, check that terminal voltage at rest sits at or above 6.0V before drawing a fault conclusion.

Device not completing boot sequence after the cell sat in storage

Ni-MH cells self-discharge during storage, and a deeply discharged cell can fall below the BMS recovery threshold — typically around 0.9V per cell, or roughly 5.4V for a 6V pack. When voltage drops below this floor, the device BMS blocks power-on entirely as a protection measure. Placing the cell on a slow trickle charge at around 15mA for 30–60 minutes usually recovers enough voltage for the BMS to re-initialise. Once the cell reads above 5.8V at rest, a normal charge cycle can proceed.