{"product_id":"extech-video-particle-counter-vpc300-built-in-camera-replacement-battery-74v-1200mah-li-ion","title":"Extech VPC300 Video Particle Counter Replacement Battery 7.4V 1200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eExtech VPC300 Video Particle Counter — 7.4V Li-ion Replacement Battery (VPC-BATT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 1200mAh Li-ion replacement battery for the Extech VPC300 Video Particle Counter with built-in camera. It fits the VPC300 directly, restoring power to the particle detection and video documentation functions. Capacity matches the OEM VPC-BATT specification at 8.88Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVPC300 platform fit:\u003c\/strong\u003e\n    The VPC300 runs its particle sensor array, optical counter, and camera module from a single 7.4V rail. This pack matches that rail voltage and the connector pinout so the instrument's power management circuit sees no mismatch on startup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran the pack through sensor initialisation and a sustained particle-counting session. The BMS held voltage stable through the camera activation spike and did not trip during the combined sensor-plus-display draw cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation calibration step:\u003c\/strong\u003e\n    After fitting a new pack, run a full calibration cycle through the VPC300 instrument menu before field deployment. The instrument maps battery state during calibration — skipping this causes premature low-battery warnings to appear before the first real measurement session ends.\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 VPC300 sat unused in a carry case for months\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the VPC300 was packed away with a partially depleted battery, the cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell. At that point the protection circuit opens and the instrument shows no charge response at all, even on a known-good charger. Apply charge for 15–30 minutes through the OEM charger before attempting to power on; most packs recover once voltage climbs back above 3.0V per cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVPC300 shuts down mid-measurement with the battery indicator still showing charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-sag event, not a capacity failure. Under sustained sensor load — optical counter running, camera active, display at full brightness — current draw is enough to pull cell voltage below the BMS cutoff threshold briefly, triggering a shutdown even though the indicator read partial charge seconds earlier. A degraded cell with high internal resistance sags faster than a fresh one under the same draw. Fit the new pack, run the calibration cycle, then check that the instrument menu shows a stable voltage reading above 7.0V during an active counting session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360540590170,"sku":"BWCS-CDT980SL-1","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360540622938,"sku":"BWCS-CDT980SL-2","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360540655706,"sku":"BWCS-CDT980SL-3","price":51.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CDT980SL-1.webp?v=1778615946","url":"https:\/\/batteryweb.com\/products\/extech-video-particle-counter-vpc300-built-in-camera-replacement-battery-74v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}