{"product_id":"aps-bc1071-replacement-battery-74v-2000mah-li-ion","title":"APS BC1071 Survey Battery 7.4V 2000mAh Li-ion Replacement","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAPS BC1071 — 7.4V Li-ion Replacement Battery (29518)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 2000mAh Li-ion battery for the APS BC1071 survey and test instrument. It replaces OEM part numbers 29518, 38403, 46607, 52030, C8872A, and EI-D-LI1. The pack ships at partial charge and requires a full charge cycle before field deployment.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBC1071 compatibility:\u003c\/strong\u003e\n    The BC1071 uses a 7.4V two-cell Li-ion configuration with a BMS handshake tied to the instrument's power rail. This pack matches that voltage rail and connector pinout, so the instrument's charge and discharge circuits communicate with the BMS correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on a BC1071-class test rig. The BMS held cutoff thresholds within spec at both the low-voltage floor and the peak charge ceiling, and the instrument read state-of-charge without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-deployment calibration cycle:\u003c\/strong\u003e\n    After installing this pack, run a full calibration cycle through the BC1071's instrument menu before heading into the field. The instrument maps battery state during calibration — skipping this step causes the low-battery warning to trigger prematurely 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 the BC1071 sat unused in a carry case for months\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge slowly during storage. If the BC1071 sits unused long enough, cell voltage drops below the BMS recovery threshold — typically around 2.5V per cell. At that point the BMS enters a protective sleep state and the instrument will not power on or accept a charge. To recover, connect the battery to a Li-ion charger that supports a trickle or recovery mode, which applies a low current to bring cell voltage above the 3.0V threshold before the BMS re-engages. Once the pack reaches 3.0V per cell, normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVoltage dropout causing readings to reset or drift mid-logging session\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUnder sustained sensor load during a long logging session, an aged or deeply discharged cell can sag below the BC1071's internal voltage threshold. When that happens the instrument resets or produces drifting readings without displaying a low-battery warning. This is not a firmware fault — it is a voltage dropout event triggered by the cell's rising internal resistance under continuous draw. Check resting cell voltage after a session; if it reads below 7.0V after a full charge, the pack has degraded and should be replaced.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360796213338,"sku":"BWCS-LI1SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360796246106,"sku":"BWCS-LI1SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360796278874,"sku":"BWCS-LI1SL-3","price":41.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1SL-1.webp?v=1778616259","url":"https:\/\/batteryweb.com\/products\/aps-bc1071-replacement-battery-74v-2000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}