Nokia Lumia 810 BP-4W Replacement Battery 3.7V 1400mAh
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Nokia Lumia 810 BP-4W Replacement Battery 3.7V 1400mAh - 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
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Nokia Lumia 810 BP-4W Replacement Battery 3.7V 1400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1400mAh
Nokia Lumia 810 / 822 — 3.7V Li-ion Replacement Battery (BP-4W)
This is a 3.7V, 1400mAh (5.18Wh) Li-ion battery using OEM part number BP-4W. It fits the Nokia Lumia 810 and Lumia 822 Windows Phone smartphones. Buy this when the original cell no longer holds enough charge for daily use.
- Lumia 810 and 822 compatibility: Both models run the same 3.7V battery rail, use an identical physical connector, and communicate with the same fuel gauge IC. BP-4W is the correct part for either handset — the BMS handshake is the same across both.
- Bench tested on actual hardware: We cycled this cell through full discharge and charge on the Lumia platform. The BMS accepted the cell without fault flags, charge current tapered correctly at end-of-charge, and the fuel gauge IC registered the new cell without intervention.
- Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle before normal use. The fuel gauge IC was calibrated to your original cell's discharge curve — one full cycle against the new cell lets it rebuild an accurate state-of-charge map.
Why the Lumia 810 reports wrong battery percentage after a cell swap
The Lumia 810 uses a coulomb-counter-based fuel gauge IC that tracks charge in and out of the original cell over its lifetime. When you swap the cell, the IC still holds the old discharge curve in memory. It will report a percentage based on a curve that no longer matches the new cell's chemistry. The fix is one full discharge — down to automatic shutdown — followed by a full uninterrupted charge. After that single cycle, the IC recalibrates against the new cell and percentage reporting stabilises.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under modem or display load — a voltage cliff the fuel gauge IC did not predict. The OS reads 25% state-of-charge, but actual cell voltage collapses below the 3.0V cutoff the moment current demand spikes. It is not a faulty battery — it is a miscalibrated gauge reading an uncycled cell. Run one full discharge to shutdown, then charge uninterrupted to 100%. After that cycle, the gauge maps the actual voltage cliff and shutdown warnings will fire at the correct percentage.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Nokia
- 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 Lumia 810 switched off at around 25% right after I put in the new battery — is the cell defective?
It is not defective. The fuel gauge IC is still using the discharge curve from your old cell and cannot predict the new cell's voltage drop under load. When the modem or screen draws a burst of current, the cell voltage collapses below 3.0V before the gauge registers low battery. Run one full discharge to automatic shutdown, then charge to 100% without interruption — the gauge recalibrates and the premature shutdowns stop.
The phone is noticeably warm near the battery compartment during the first few charges — is that normal?
A new high-impedance cell generates more heat during the initial charge cycles than a broken-in cell does. The charge IC pushes current into a cell with higher internal resistance, which dissipates as heat. It settles after two or three full cycles as the cell's impedance drops. If the back of the phone becomes too hot to hold comfortably, disconnect the charger and let the phone cool to room temperature before resuming.
The Lumia 810 will not power on at all after the replacement battery sat unused for several months — how do I recover it?
Self-discharge below 2.5V per cell trips the BMS into a protection lockout state, and the phone will not respond to a normal power button press. Connect the phone to a wall charger — not a PC USB port — and leave it for at least 20 minutes without pressing anything. The charge IC will trickle-charge the cell back above the 2.5V threshold, at which point the BMS releases its lockout and the phone powers on normally.
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