{"product_id":"grason-stadler-gsi-70-replacement-battery-72v-2000mah-ni-mh","title":"Grason Stadler GSI 70 Compatible Battery 7.2V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGrason Stadler GSI 70 — 7.2V Ni-MH Replacement Battery (1770-9672)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 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.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGSI 70 series fit:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap startup protocol:\u003c\/strong\u003e\n    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.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GSI 70 reports a battery fault on a fully charged new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 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.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGSI 70 will not power on after the battery sat unused in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-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.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381509980250,"sku":"BWCS-WB170MD-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381510013018,"sku":"BWCS-WB170MD-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381510045786,"sku":"BWCS-WB170MD-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WB170MD-1.webp?v=1778901340","url":"https:\/\/batteryweb.com\/products\/grason-stadler-gsi-70-replacement-battery-72v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}