{"product_id":"atmos-airway-suction-unit-c261-replacement-battery-144v-6000mah-li-ion","title":"Atmos 313.0053.0 Airway Suction C261 14.4V Replacement Battery","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAtmos Airway Suction Unit C261 — 14.4V Li-ion Replacement Battery (313.0053.0)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V, 6000mAh Li-ion battery pack for the Atmos Airway Suction Unit C261, Airway Suction Unit E341, Suction Pump A161, and Suction Pump A261. It matches OEM part numbers 313.0053.0, 319.0031.0, and 110607-O. Voltage and capacity are direct matches to the original specification — do not substitute a lower-capacity pack in a clinical setting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC261, E341, A161, A261 platform compatibility:\u003c\/strong\u003e\n    These Atmos suction units share the same 14.4V battery rail, connector pinout, and BMS communication protocol. A single replacement pack covers all listed models because the charge IC and cell configuration are identical across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through a full charge cycle and monitored the BMS handshake at startup. The pack cleared voltage verification, capacity reporting, and load-draw checks without triggering a fault code on the C261 control board.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, let the device complete its full power-on self-test without interrupting it. The C261 runs a BMS verification sequence at every boot — cutting power mid-cycle writes a false battery fault flag that persists until the next clean 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 C261 alarms low battery immediately after a confirmed full charge\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe C261's BMS stores a learned capacity baseline from the previous cell. A new pack with a different cell configuration can report a state-of-charge value the BMS hasn't calibrated against yet, triggering a low-battery alarm even when the pack is fully charged. This is not a fault with the replacement cell — it is the device's charge IC applying a conservative threshold until it completes a learn cycle. Run one full charge-to-discharge-to-charge cycle before trusting the battery indicator in clinical use. After that cycle, the BMS recalibrates its baseline and the alarm clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice won't power on after the replacement pack sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the pack voltage dropped below approximately 10V before installation, the C261's BMS protection circuit will block startup entirely to prevent cell damage — the device appears dead with no response. Place the battery on a compatible charger and leave it for a full charge cycle before attempting to power the unit on. Once the pack recovers above the BMS recovery threshold (typically 12V for a 14.4V 4S pack), normal startup resumes. Do not repeatedly attempt to boot the device while the pack is below recovery voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381433434202,"sku":"BWCS-WM1163MD-1","price":109.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381433466970,"sku":"BWCS-WM1163MD-2","price":129.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381433499738,"sku":"BWCS-WM1163MD-3","price":143.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WM1163MD-1.webp?v=1778900788","url":"https:\/\/batteryweb.com\/products\/atmos-airway-suction-unit-c261-replacement-battery-144v-6000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}