Welch-Allyn Audiopath GSI 70 Compatible Battery 7.2V 2000mAh

Welch-Allyn Audiopath GSI 70 — 7.2V Ni-MH Replacement Battery (1770-9672)

This is a 7.2V, 2000mAh Ni-MH battery for the Welch-Allyn Audiopath GSI 70 portable audiometer. It fits the GSI 70 and Audio Path variants that use OEM part numbers 1770-9672, AMED2005, 5046, B11176, and B11190. If your unit is showing low-battery faults or failing to hold charge through a full test session, this is the direct replacement cell.

• GSI 70 platform fit: The Audiopath GSI 70, GSI 70, and Audio Path models all draw from the same 7.2V Ni-MH cell architecture with a shared connector and BMS handshake profile. Any of these units accepts this battery without modification to the bay or firmware.
• Bench tested on actual hardware: We cycled this cell through a full charge and load discharge at the 7.2V nominal rail. The BMS accepted the cell, completed its verification pass, and flagged no fault codes after the first full cycle.
• Power-on self-test protocol: After installing this battery, allow the GSI 70 to complete its full startup self-test without interruption. The device runs a BMS verification sequence at boot — cutting power mid-sequence creates a false battery fault that persists until the next clean reboot with a full charge present.

GSI 70 alarming low battery immediately after a confirmed full charge

The GSI 70's charge management circuit was calibrated against an OEM cell with an established charge history. A new Ni-MH cell reads slightly lower internal resistance and a flatter early-cycle voltage curve, which the BMS can misread as a degraded or undercharged pack. This is not a fault with the replacement cell — it is a learn-cycle issue. Run one complete charge-to-discharge cycle under normal clinical load and allow the unit to recharge fully before the second session. After that first cycle, the BMS recalibrates its threshold and the low-battery alarm clears. Verify charge completion at the charger indicator before powering the device on.

GSI 70 not completing its boot sequence after the battery sat in storage

Ni-MH cells self-discharge at roughly 1–2% per day in storage. A cell that has sat for several months can drop below 6.0V — which is the common BMS recovery threshold on this class of medical device. Below that voltage, the BMS refuses to boot the unit as a safety measure. Connect the battery to the charger for a minimum of 12 hours before attempting to power on the device. If the charger does not respond initially, a trickle-charge pre-conditioning stage may be needed — some chargers designed for Ni-MH begin this automatically when the cell presents below 5.5V. Once the cell recovers above the BMS floor, normal charging and boot behaviour resumes.