{"product_id":"netgear-sph-101-replacement-battery-37v-950mah-li-ion","title":"Netgear SPH-101 VoIP Phone Compatible Battery 3.7V 950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNetgear SPH-101 — 3.7V Li-ion Replacement Battery (300-10021-01)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 950mAh Li-ion cell replaces the OEM battery in the Netgear SPH-101 VoIP cordless handset. The SPH-101 is a Wi-Fi-based VoIP phone — this battery keeps the handset operational and, when fully charged, allows the phone to function through brief power interruptions. Match the OEM part number 300-10021-01 before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSPH-101 handset fit:\u003c\/strong\u003e\n    The SPH-101 uses a dedicated 3.7V single-cell pack with a specific connector orientation and contact arrangement. Voltage and physical format must match — substituting a generic pack of similar size risks a connector mismatch or BMS communication failure with the handset's charge circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the SPH-101 platform and confirmed the BMS accepted the pack without triggering a fault state. Charge termination occurred correctly at 4.2V and the handset did not flag a battery error on the status screen.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for backup activation:\u003c\/strong\u003e\n    After installing this battery, power-cycle the handset and place it on charge for a full four hours before testing backup function. The SPH-101's firmware will not engage the backup circuit until the cell crosses the minimum charge threshold — testing backup power before that point will appear as a failure even with a good cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SPH-101 shows a low battery warning immediately after a new cell is installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eReplacement cells ship in a storage state, typically between 30–50% charge. The SPH-101 reads cell voltage directly and compares it against a threshold — if the resting voltage sits below roughly 3.6V, the handset displays a low battery indicator regardless of whether the cell is new. This is not a fault with the battery. Place the handset on its base and allow a full charge cycle to complete before drawing any conclusions about the replacement cell's condition.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSPH-101 loses programmed settings when mains power drops after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe SPH-101 relies on the backup battery to hold volatile memory — Wi-Fi credentials, SIP registration, and speed-dial entries — during a mains outage. If the replacement cell has not reached a full charge state, the backup circuit will not sustain the phone and settings will reset on power restoration. This is a firmware-enforced protection, not a hardware fault. Charge the handset uninterrupted for four hours, confirm the battery indicator shows full, then test backup behaviour by pulling mains power briefly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43428090708058,"sku":"BWCS-SPH101SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43428090740826,"sku":"BWCS-SPH101SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43428090773594,"sku":"BWCS-SPH101SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SPH101SL_1.webp?v=1779934037","url":"https:\/\/batteryweb.com\/products\/netgear-sph-101-replacement-battery-37v-950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}