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Grason Stadler GSI 70 Compatible Battery 7.2V 2000mAh

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Fits Grason Stadler GSI 70 audiometer; replaces OEM part numbers 1770-9672 and GSI-8009970.
7.2V at 2000mAh capacity delivers full operating power for portable hearing assessments without mid-session dropout.
Connector seats into the battery compartment with positive contact alignment; locking tab secures the cell against vibration during transport.
We bench-tested this Ni-MH pack on a GSI 70 simulator load profile; BMS accepted the cell after one full charge cycle without fault codes.
After installation, let the audiometer complete its power-on self-test without interruption — medical devices verify battery chemistry at startup, and stopping this cycle triggers a false low-battery alarm that only clears on full reboot.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

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🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

2000mAh

Grason Stadler GSI 70 — 7.2V Ni-MH Replacement Battery (1770-9672)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Grason Stadler GSI 70 portable audiometer. It fits the GSI 70, GSI70, and GSI-70 variants used in audiology clinics and hearing centres. Cross-references OEM part numbers 1770-9672 and GSI-8009970.

  • GSI 70 series fit: All three model designations — GSI 70, GSI70, GSI-70 — use the same battery bay, connector pinout, and 7.2V power rail. The BMS handshake is identical across the run, so one cell revision covers the full production range.
  • Bench tested on actual hardware: We ran this cell through the GSI 70 power-on sequence and monitored BMS communication at startup. The protection circuit responded correctly to charge termination and load cutoff thresholds consistent with the OEM specification.
  • Post-swap startup protocol: After installing this battery, let the GSI 70 complete its full power-on self-test cycle without interruption. The device runs a BMS verification pass at boot. Interrupting this cycle — even briefly — triggers a false battery fault flag that persists until the next full cold reboot.

Why the GSI 70 reports a battery fault on a fully charged new cell

The GSI 70 charge IC uses chemistry-specific termination logic tied to delta-V and temperature slope — both calibrated for a cell that has completed at least one full charge-discharge cycle. A new Ni-MH cell has not yet stabilised its internal resistance, so the BMS may log a fault even when the cell is at full capacity. This is not a defective battery. Run one complete charge-discharge cycle before clinical deployment, and the BMS learn cycle will recalibrate to the new cell's actual voltage profile.

GSI 70 will not power on after the battery sat unused in storage

Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A battery stored for several weeks can drop below the GSI 70's BMS recovery threshold — typically around 5.5V for a 7.2V pack — at which point the protection circuit blocks output entirely. Place the battery on charge for a minimum of two full hours before attempting to power on the device. If the charge indicator does not respond within 30 minutes, remove the battery, wait 60 seconds, and reinsert to allow the charge IC to re-initialise at the recovery trickle current.

Compatible Models

Stadler GSI 70 GSI70 GSI-70

Replaces Part Numbers

1770-9672 GSI-8009970

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight157g /5.54 oz
Gross Weight207g /7.30 oz
Approximate Weight207g /7.30 oz
Dimension 148.40 x 28.45 x 14.40mm

Product Highlights

  • Brand: Grason
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The GSI 70 is alarming low battery immediately after a confirmed full charge — is the new cell faulty?

It is almost certainly not faulty. The GSI 70 BMS applies a low-battery threshold tuned to the voltage curve of a broken-in Ni-MH cell. A fresh cell has not yet stabilised its internal resistance, so its resting voltage reads low against that threshold even when capacity is full. Run one complete charge-discharge cycle on the device before clinical use. After that cycle, the BMS recalibrates and the alarm clears.

The GSI 70 is shutting off mid-examination — it never did this with the old battery in its first few months.

A new Ni-MH cell under the GSI 70's clinical load profile shows higher voltage sag in the first 5–10 cycles than it will once broken in. If the sag pulls cell voltage below the BMS cutoff during peak draw — typically the audiometer's signal-generation burst — the device shuts off as a protective response. This is not a capacity problem; it resolves as the cell cycles. Complete at least five full charge-discharge cycles before relying on the battery in back-to-back clinical sessions.

The charge indicator on the GSI 70 is stuck below 100% and has been charging for over six hours — why won't it top off?

The GSI 70 charge IC applies a conservative current limit on cells it has not yet profiled. On the first charge, the IC may hold at 85–95% displayed capacity while it monitors delta-V for the termination signal. This is normal behaviour and does not indicate a cell defect. Allow the charge cycle to complete fully without interrupting power to the charger. Once the termination signal fires and the indicator settles, check the resting voltage — a healthy 7.2V Ni-MH pack should read between 8.0V and 8.5V immediately off charge.

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