{"product_id":"tpi-hxg-2d-replacement-battery-36v-2000mah-ni-mh","title":"TPI A007 HXG-2D Survey Instrument Replacement Battery 3.6V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTPI HXG-2D Series — 3.6V Ni-MH Replacement Battery (A007)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 2000mAh Ni-MH battery pack for the TPI HXG-2D and related instruments including the 712 and 709R. It replaces OEM part numbers A007, 160AAH3BML, and A774. The pack fits the HXG-2D combustible gas leak detector and compatible survey and test instruments in the same family.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHXG-2D family compatibility:\u003c\/strong\u003e\n    These models share a common 3.6V three-cell NiMH voltage rail, the same physical connector footprint, and a passive BMS interface — no active handshake required, which means the pack slots in without firmware negotiation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through power-on sequencing and sensor initialisation cycles on the HXG-2D platform. The BMS held stable through the current spike at probe power-up without tripping into protection mode.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this pack, run a full calibration cycle through the instrument menu before taking it into the field. The HXG-2D maps battery state during calibration — skip this and the instrument will throw 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\"\u003eWhy the HXG-2D shuts down at probe sensor initialisation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the HXG-2D powers up its gas sensor, there is a short but sharp current draw as the probe heater element reaches operating temperature. An aged or partially discharged NiMH pack can sag below the instrument's cutoff threshold during this spike — not because the pack is empty, but because internal resistance has increased enough to cause a voltage dip. A fresh pack with low internal resistance handles the spike without dropping out. If the shutdown happens every time at the same point in the boot sequence, that is the cause.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePack will not charge after months sitting unused in a carry case\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH cells self-discharge over time, and after an extended storage period the pack voltage can fall low enough that the charger circuit refuses to begin a charge cycle — it reads the pack as a fault condition rather than a depleted battery. This is a BMS sleep state, not a dead pack. To recover it, connect the instrument to its charger and leave it for 30–60 minutes without interruption — some chargers will trickle a small recovery current before switching to full charge. If the charge LED stays off after that window, check the pack voltage directly at the terminals; a reading below 2.4V means the cells need a forced low-current recovery charge before the standard cycle will take.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360715472986,"sku":"BWCS-TPH200SL-1","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360715505754,"sku":"BWCS-TPH200SL-2","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360715538522,"sku":"BWCS-TPH200SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TPH200SL-1.webp?v=1778616232","url":"https:\/\/batteryweb.com\/products\/tpi-hxg-2d-replacement-battery-36v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}