{"product_id":"novker-aua800-replacement-battery-37v-4000mah-li-polymer","title":"Novker AUA800 Replacement Battery 3.7V 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNovker AUA800 Series — 3.7V Li-Polymer Replacement Battery (20031019344)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 4000mAh lithium-polymer pack replaces OEM part 20031019344 in Novker field survey and test instruments. It fits the AUA800, AUA900A, AUA900D, NK3200D, and several additional models in the same family. Capacity is 4000mAh (14.8Wh) — matched to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAUA800 and AUA900 series compatibility:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol. The NK3200D runs the same voltage rail, so one pack covers the full platform 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 probe initialisation events and sustained sensor logging loads. The BMS held stable across cold-start current spikes and did not trip under the combined draw of sensor power and display backlight.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration on Novker instruments:\u003c\/strong\u003e\n    After installing, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings on the 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 lockout after a Novker instrument sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-polymer cells self-discharge slowly in storage. If the pack drops below roughly 2.5V per cell, the BMS enters a protective lockout and the instrument will not power on or show any charge indicator. A standard charger connected to the instrument may not recover the pack because the charger handshake expects a minimum cell voltage before initiating current flow. To recover, apply a low-rate pre-charge directly to the battery contacts at 0.1C until cell voltage climbs above 3.0V, then resume normal charging through the instrument.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings resetting or dropping out mid-logging session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is not a capacity problem — it is a voltage sag event. Under sustained sensor load, an aged or partially discharged cell can dip below the instrument's undervoltage threshold for a fraction of a second, which triggers a data-logging reset or display flicker. A new pack at full charge holds its voltage flatter under load. If the symptom continues after fitting a fresh pack, check that the battery contacts on the instrument are clean and making full surface contact — resistance at the connector amplifies voltage drop under load. Target a resting cell voltage of at least 3.7V before starting a long logging session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360429703258,"sku":"BWCS-NKR320SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360429736026,"sku":"BWCS-NKR320SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360429768794,"sku":"BWCS-NKR320SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKR320SL_1.webp?v=1778614656","url":"https:\/\/batteryweb.com\/products\/novker-aua800-replacement-battery-37v-4000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}