{"product_id":"rae-systems-rae029-0695000-replacement-battery-74v-1800mah-li-ion","title":"RAE Systems 029-3501-000 Compatible Battery 7.4V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRAE Systems RAE029-0695000 \/ RAELink 3 Series — 7.4V Li-ion Replacement Battery (029-3501-000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V, 1800mAh Li-ion replacement battery for RAE Systems multi-gas detectors and wireless transmitters. It fits the RAE029-0695000, RAELink 3 Mesh, RAELink 3 Mesh Radio, and RAELink 3 Wireless Transmitter. Capacity is 13.32Wh, matching the OEM spec from RAE Systems part number 029-3501-000.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRAELink 3 and RAE029-0695000 compatibility:\u003c\/strong\u003e\n    These models share the same 7.4V battery rail, connector footprint, and BMS handshake protocol. One cell pack services the full group — no adapter or modification needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack on a RAELink 3 Mesh unit and cycled through sensor initialisation and active RF transmission. The BMS held steady through the current spike at radio power-up and did not trip during sustained sensor polling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, run a full calibration cycle through the instrument menu before field deployment. The RAE Systems firmware maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even with a full charge.\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 RAELink 3 unit sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells in low-draw standby devices self-discharge slowly over months. If the pack voltage drops below roughly 2.5V per cell, the BMS trips into deep-discharge protection and the instrument will not power on or charge normally. This is not a dead battery — it is a protection state. Applying a charger at that point often shows no charge activity because the BMS is blocking current input. To recover the pack, connect it to a compatible charger for at least 30 minutes without interruption; some chargers require a trickle-charge wake cycle before full charge current resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eReadings drifting or logging session resetting mid-run\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eUnder sustained sensor load — particularly when multiple gas sensors are actively polling — the battery voltage can sag below the instrument's stable-operation threshold without the low-battery indicator triggering first. The firmware interprets this momentary voltage dropout as a fault condition and resets the active logging session. This is not a sensor fault. Check the battery voltage under load using the instrument's diagnostic menu; if it reads below 6.8V during active sensor use, the cell capacity has degraded and the pack needs replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360435470426,"sku":"BWCS-REM300SL-1","price":223.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360435503194,"sku":"BWCS-REM300SL-2","price":267.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360435535962,"sku":"BWCS-REM300SL-3","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-REM300SL-1.webp?v=1778614760","url":"https:\/\/batteryweb.com\/products\/rae-systems-rae029-0695000-replacement-battery-74v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}