{"product_id":"verizon-jetpack-ac791l-replacement-battery-38v-4300mah-li-ion","title":"Verizon Jetpack AC791L Compatible Battery 3.8V 4300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVerizon Jetpack AC791L — 3.8V Li-ion Replacement Battery (W-9)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 4300mAh Li-ion battery fits the Verizon Jetpack AC791L mobile hotspot. It replaces OEM part numbers W-9, W-9B, and 308-10013-01. If your Jetpack shuts down unexpectedly or no longer holds a charge, this is a direct swap to restore full operation.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAC791L fit:\u003c\/strong\u003e\n    The AC791L runs a combined LTE modem and multi-device Wi-Fi radio from a single cell. The BMS on this battery matches the charge termination voltage and communication protocol the device expects — no error flags on startup.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through combined modem and Wi-Fi load on the AC791L. The BMS held stable at full multi-device draw and did not trip under the simultaneous radio output that typically stresses original cells.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eVentilation during extended sessions:\u003c\/strong\u003e\n    When connected devices are far from the hotspot, the cellular radio runs at maximum output power to maintain signal. Place the AC791L on a hard, open surface — not inside a bag or pocket — during long sessions to prevent heat buildup from accelerating cell wear.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the AC791L drops connections mid-session under full device load\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AC791L runs its LTE modem and 802.11ac radio simultaneously from a single 3.8V cell. At maximum connected devices, combined draw spikes sharply — especially when the modem is compensating for weak signal. A degraded or aging cell cannot sustain voltage at that draw, and the BMS triggers a protective cutoff before the battery physically depletes. The hotspot loses power briefly, drops all connected clients, and reboots. A fresh cell with full capacity handles the spike without voltage sag triggering the cutoff.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAC791L won't boot after sitting unused for weeks\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the AC791L sat unpowered long enough, the battery may have dropped below the minimum boot voltage — typically under 3.0V for a 3.8V nominal cell. At that level, the device's BMS locks out charging as a safety measure and the hotspot appears completely dead. Connect it to the OEM charger and leave it for 20–30 minutes without pressing the power button — most BMS circuits enter a trickle pre-charge mode that recovers the cell back above the 3.0V threshold before allowing a normal charge cycle to begin.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43377832788058,"sku":"BWCS-PTR791SL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43377832820826,"sku":"BWCS-PTR791SL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43377832853594,"sku":"BWCS-PTR791SL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PTR791SL-1.webp?v=1778773880","url":"https:\/\/batteryweb.com\/products\/verizon-jetpack-ac791l-replacement-battery-38v-4300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}