{"product_id":"boostmobile-aircard-779s-replacement-battery-37v-2400mah-li-ion","title":"BoostMobile AirCard 779S Compatible Battery 3.7V 2400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBoostMobile AirCard 779S — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 2400mAh Li-ion battery fits the BoostMobile AirCard 779S mobile hotspot and its variants — the AirCard 779S 4G, AC779S, and NTGR779ABB. It slots into the same cavity as the original cell and connects to the same BMS interface. Capacity is rated at 8.88Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAirCard 779S variant compatibility:\u003c\/strong\u003e\n    The 779S, 779S 4G, AC779S, and NTGR779ABB all share the same battery bay dimensions and 3.7V single-cell architecture. The BMS handshake is identical across these SKUs, so one cell works across the entire family without firmware mismatch.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under combined cellular modem and Wi-Fi radio load at maximum connected devices. The BMS held voltage above the 3.2V cutoff threshold throughout the discharge cycle and showed no spurious low-battery shutdowns.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eVentilation during extended sessions:\u003c\/strong\u003e\n    Keep the 779S flat on a hard surface with its vents unobstructed during long hotspot sessions. When the cellular radio is pushing maximum output — common in weak signal areas — heat builds at the battery. A blocked vent accelerates cell aging faster than cycling does.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the AirCard 779S drops all connected devices mid-session\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 779S runs two power-hungry systems simultaneously — the 4G LTE modem and the Wi-Fi radio. At maximum client connections, combined draw can cause voltage to sag below the BMS protection floor, triggering an abrupt shutdown that looks like a Wi-Fi drop to connected devices. An aged original battery with elevated internal resistance hits this sag point much earlier in the discharge curve. A fresh cell with lower internal resistance sustains the voltage rail long enough for the BMS to stay clear of the cutoff threshold under that same combined load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAirCard 779S won't boot after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge at roughly 2–3% per month at room temperature. If the 779S sat stored with a partially depleted battery, the cell can drop below the minimum boot voltage — typically around 3.0V — and the device will not respond to the power button. Plugging into the charger first is the correct step, but if the cell is too far discharged, the charger's pre-charge circuit must bring it back above 3.0V before the hotspot firmware will initialise. Leave it on charge for at least 20 minutes before attempting to power on.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377839997018,"sku":"BWCS-ATP779RX-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377840029786,"sku":"BWCS-ATP779RX-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377840062554,"sku":"BWCS-ATP779RX-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ATP779RX-1.webp?v=1778773879","url":"https:\/\/batteryweb.com\/products\/boostmobile-aircard-779s-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}