Netgear SPH-101 VoIP Phone Compatible Battery 3.7V 950mAh
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Netgear SPH-101 VoIP Phone Compatible Battery 3.7V 950mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Netgear SPH-101 VoIP Phone Compatible Battery 3.7V 950mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
950mAh
Netgear SPH-101 — 3.7V Li-ion Replacement Battery (300-10021-01)
This 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.
- SPH-101 handset fit: 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.
- Bench tested on actual hardware: 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.
- First-charge protocol for backup activation: 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.
Why the SPH-101 shows a low battery warning immediately after a new cell is installed
Replacement 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.
SPH-101 loses programmed settings when mains power drops after battery swap
The 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.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Netgear
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My SPH-101 shows a battery health warning on screen right after I put the new battery in — is the replacement cell dead?
It is not dead. The SPH-101 firmware runs a voltage check on installation, and replacement cells typically rest below 3.6V after storage — that threshold triggers the warning. Place the handset on the base station and let it charge uninterrupted for four hours. Once the cell reaches full charge, the warning clears on its own.
I tested backup power by unplugging the SPH-101 right after installing the new battery and the phone shut off immediately — what's wrong?
Nothing is wrong with the cell. The SPH-101's backup circuit has a firmware gate that requires the battery to reach a full charge state before the phone will draw from it during an outage. A cell at storage charge — typically 30–50% — will not pass that gate. Charge the handset for four full hours, confirm the on-screen battery indicator reads full, then repeat the outage test.
After a power cut, my SPH-101 came back on but all my Wi-Fi and SIP settings were wiped — I thought the new battery was supposed to prevent that?
The battery does preserve those settings, but only when it holds sufficient charge at the moment power drops. If the handset was not fully charged before the outage, the backup circuit could not sustain the phone long enough to protect volatile memory. Charge the handset to 100% and keep it docked when not in use — the SPH-101 only writes settings to persistent memory after a clean shutdown, not during a hard power loss.
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