{"product_id":"veins-accuvein-av400-replacement-battery-37v-3100mah-li-ion","title":"Veins Accuvein AV400 Compatible Battery 3.7V 3100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVeins Accuvein AV400 — 3.7V Li-ion Replacement Battery (ACCUAVBA400)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 3100mAh Li-ion battery replaces the internal cell in the Accuvein AV400 handheld vein finder. The AV400 uses near-infrared projection to visualise subcutaneous veins, and its battery must deliver consistent output to maintain accurate imaging during clinical procedures. Swapping a degraded cell restores full operational availability without replacing the entire unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAV400 platform compatibility:\u003c\/strong\u003e\n    The AV400 uses a fixed 3.7V single-cell Li-ion architecture with a BMS that monitors cell voltage and temperature during operation. This replacement cell matches the OEM voltage rail and connector footprint, so the charge IC communicates with the BMS without a handshake error on first boot.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, boot self-test, and active imaging load on an AV400 unit. The BMS accepted the cell on the first full charge cycle and reported accurate state-of-charge without triggering a false fault flag.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, let the AV400 complete its full power-on self-test without interrupting the sequence. The device runs a BMS verification routine at startup — cutting power mid-cycle causes a battery fault flag that persists until the next clean, full reboot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the AV400 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe AV400's BMS stores a learned capacity profile from the OEM cell. When a new replacement cell is installed, the BMS has no reference data for the new cell's actual charge curve, so it applies a conservative threshold that can trigger a low-battery alarm even at a high state of charge. This resolves after one complete charge-discharge cycle, which allows the BMS to build an accurate profile for the new cell. Do not use the device clinically until that first full cycle is complete.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAV400 not completing boot sequence after battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If a replacement cell drops below approximately 2.5V before installation, the AV400's BMS will refuse to power the device — this is a protection cutoff, not a dead cell. Place the battery on charge immediately after unpacking and leave it connected for a full cycle before attempting to power on. Most BMS recovery circuits begin accepting current above 3.0V, so a short initial charge period is enough to clear the lockout.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381404237914,"sku":"BWCS-AVS400MD-1","price":67.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381404270682,"sku":"BWCS-AVS400MD-2","price":79.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381404303450,"sku":"BWCS-AVS400MD-3","price":88.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVS400MD-1.webp?v=1778900597","url":"https:\/\/batteryweb.com\/products\/veins-accuvein-av400-replacement-battery-37v-3100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}