{"product_id":"bird-vela-6-hour-replacement-battery-12v-3500mah-ni-mh","title":"Bird Vela 6 Hour 12V Replacement Battery 3500mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBird Vela 6 Hour — 12V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V 3500mAh Ni-MH replacement battery for the Bird Vela 6 Hour portable ventilator. It fits the extended-operation variant used for patient transport and backup power continuity. Capacity is 42Wh, matching the original cell specification for this unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVela 6 Hour platform fit:\u003c\/strong\u003e\n    The 6 Hour model runs a dedicated battery bay sized for this cell's 84.60 × 68.10 × 34.00mm footprint. The BMS on this ventilator handshakes over the connector for both charge state and fault detection — connector alignment and cell chemistry both need to match for the BMS to report status correctly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge and discharge cycles on this cell and confirmed the BMS accepted charge without triggering a chemistry mismatch fault. The protection circuit responded correctly to load and returned accurate state-of-charge data through the full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation self-test protocol:\u003c\/strong\u003e\n    After fitting this battery, allow the Vela to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this window logs a battery fault that persists until the next clean reboot, not until the next charge.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vela 6 Hour reports a battery fault after a confirmed full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Vela's BMS uses learned capacity thresholds calibrated to the original cell's charge curve. A new Ni-MH cell has a slightly different voltage response during the first few cycles, which can push it outside the BMS acceptance window even at 100% charge. This triggers a fault flag rather than a chemistry error. One full charge-discharge cycle usually brings the cell's curve within the BMS threshold and clears the fault on the next startup.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eVela 6 Hour not completing boot sequence on new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the cell voltage sat below 10V during storage, the Vela's BMS may not supply enough rail voltage to complete the boot sequence — the device powers on briefly, then cuts off. This is a deep-discharge recovery situation, not a dead cell. Connect the ventilator to mains power and leave the battery on charge for a full cycle before attempting battery-only boot. Once the cell recovers above the BMS recovery threshold, typically around 10.8V, the boot sequence completes normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381498839130,"sku":"BWCS-AVS497MD-1","price":81.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381498871898,"sku":"BWCS-AVS497MD-2","price":95.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381498904666,"sku":"BWCS-AVS497MD-3","price":106.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AVS497MD-1.webp?v=1778901248","url":"https:\/\/batteryweb.com\/products\/bird-vela-6-hour-replacement-battery-12v-3500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}