{"product_id":"amc-39453945-b-replacement-battery-96v-3600mah-ni-mh","title":"AMC 3945 Replacement Battery 9.6V 3600mAh Ni-MH 2140.19","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAMC 3945\/3945-B Series — 9.6V Ni-MH Replacement Battery (2140.19)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9.6V, 3600mAh Ni-MH replacement battery for AMC surveying and measurement instruments. It fits the 3945, 3945-B, 8333, 8335, and 8336 models, along with five additional compatible units in the same instrument family. Voltage and connector match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3945\/3945-B and 8333–8336 series fit:\u003c\/strong\u003e\n    These models share the same 9.6V eight-cell Ni-MH voltage rail, identical connector pinout, and the same current threshold in the instrument's power management circuit. One pack covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through three charge-discharge sequences and monitored BMS handshake at probe initialisation. The cell stack held voltage above the instrument's low-battery cutoff through sustained sensor load without triggering a spurious shutdown.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eInstrument calibration cycle before first field use:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the instrument menu before taking it to site. The 3945 series maps battery state during calibration — skipping this step causes premature low-battery warnings on your first measurement session, even with a fully charged pack.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff at probe or sensor initialisation on the 3945 series\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the 3945 powers up a probe module, it draws a short current spike as the sensor circuit initialises. A degraded or partially discharged Ni-MH pack can drop below the BMS cutoff threshold during that spike, causing the instrument to shut off immediately after probe connection. This is not a faulty instrument — it's a cell voltage sag event. A fully charged pack with healthy cells clears the initialisation spike without tripping the cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings drifting or logging session resetting mid-measurement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUnder sustained sensor load during a logging session, an ageing pack develops a voltage dropout that falls below the 3945's operating floor. The instrument interprets this as a low-power event and resets the active session to protect data integrity. The fix is not a restart — it's a full charge before the session and a check that resting voltage reads at or above 10.8V after charging. If the pack won't hold above that threshold, the cells have fatigued beyond recovery and need replacing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360728219738,"sku":"BWCS-AMC833SL-1","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360728252506,"sku":"BWCS-AMC833SL-2","price":88.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360728285274,"sku":"BWCS-AMC833SL-3","price":97.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AMC833SL-1.webp?v=1778616209","url":"https:\/\/batteryweb.com\/products\/amc-39453945-b-replacement-battery-96v-3600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}