{"product_id":"ando-aq7250-replacement-battery-108v-3500mah-ni-mh","title":"Ando AQ7250 Replacement Battery 10.8V 3500mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAndo AQ7250 \/ AQ7250 Mini-OTDR — 10.8V Ni-MH Replacement Battery (9HR-4\/3FAU)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 3500mAh Ni-MH replacement battery for the Ando AQ7250 and AQ7250 Mini-OTDR optical time-domain reflectometers. It replaces OEM part number 9HR-4\/3FAU. Both instruments run on the same battery platform and connector configuration.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAQ7250 and AQ7250 Mini-OTDR compatibility:\u003c\/strong\u003e\n    Both units share the same 10.8V battery rail, connector pinout, and BMS handshake protocol — one pack covers either instrument without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through the AQ7250 power-on sequence and monitored BMS response during optical probe initialisation. The cell array held voltage through the laser-module startup spike without triggering a protection cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration step:\u003c\/strong\u003e\n    After fitting this pack, run a full instrument calibration cycle through the AQ7250 menu before field deployment. The instrument maps battery state during calibration — skipping this causes premature low-battery warnings to appear during your first measurement session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff during laser module initialisation on the AQ7250\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the AQ7250 powers up, the laser and optical probe draw a short, sharp current spike before settling into steady-state measurement load. A degraded or deeply discharged Ni-MH pack can drop below the BMS undervoltage threshold during that spike, triggering an immediate protection cutoff that looks like a dead battery. This is a cell-state issue, not a fault in the instrument. Charge the pack fully — confirmed at the charger's green light — then power on the instrument while the pack is still warm from charging, which reduces internal resistance and softens the voltage sag on that first spike.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAQ7250 displaying a frozen or jumping battery percentage at reboot\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AQ7250 estimates charge state from a voltage threshold map calibrated to the original cells. A new or replacement Ni-MH pack has a different resting voltage profile until it has been through several charge-discharge cycles, so the percentage indicator recalibrates slowly and can read 40% one boot and 75% the next. This is normal for the first three to five full cycles. Run the instrument until the low-battery warning appears, then charge to completion — repeating this three times stabilises the reading. After conditioning, the display should track consistently within a few percentage points of actual remaining charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360762757210,"sku":"BWCS-AQ7250SL-1","price":77.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360762789978,"sku":"BWCS-AQ7250SL-2","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360762822746,"sku":"BWCS-AQ7250SL-3","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AQ7250SL-1.webp?v=1778616258","url":"https:\/\/batteryweb.com\/products\/ando-aq7250-replacement-battery-108v-3500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}