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Biackphone BP1 Replacement Battery 3.7V 2000mAh

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From $24.99 USD $30.99
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Fits BlackPhone BP1 smartphone; replaces OEM battery SKU CS-WKM001SL.
3.7V, 2000mAh Li-ion cell delivers 7.4Wh capacity for full-day mixed use on BP1.
Connector seats into BP1 battery slot with standard smartphone contact alignment; no locking tab required.
We bench-tested the cell at 1A discharge against BP1 firmware; BMS initialized cleanly and fuel gauge accepted the new curve after first full cycle.
On first charge after installation, run one complete discharge-charge cycle before enabling fast charging—this lets the BP1 fuel gauge IC recalibrate against the new cell's discharge curve and prevents erratic percentage reporting.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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🚚 A Few Extra Days for a Better Battery

To provide the highest-quality fresh replacement battery, we ship directly from the manufacturer rather than from aging warehouse inventory. This ensures you receive a fresh battery with better performance, longer lifespan, and greater reliability.

📦 Estimated delivery: 7–10 business days

✅ By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.

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Check that your old battery model number and device model to match our description. This makes sure they work together.

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We ship your order same day if you buy it before 4 PM EST.

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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

🔹 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: 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.

Voltage

3.7V

Amp

2000mAh

Biackphone BP1 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2000mAh (7.4Wh) Li-ion cell built to replace the original battery in the Biackphone BP1 smartphone. It matches the factory voltage and capacity spec, and fits within the BP1's 70.05 x 59.95 x 4.31mm battery bay. Use it when the original cell no longer holds a charge or fails to power the device through a full day.

  • BP1 fitment: The BP1 uses a single-cell 3.7V Li-ion pack with a dedicated fuel gauge IC that tracks charge via coulomb counting. This replacement cell matches the voltage rail and connector pinout that the BP1's charge controller expects.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on a calibrated rig, confirming the BMS accepts charge from the BP1's charge IC without cutoff or rejection on the first cycle at standard current.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's actual discharge curve before the OS starts reporting percentage from it.

Sudden shutdown at 20–30% on the Biackphone BP1

The BP1's modem and display draw current in short, high bursts. If the cell's internal resistance is elevated — either from age on the original or from an uncalibrated state on a new cell — terminal voltage drops sharply under that load. The fuel gauge IC reads voltage, not just stored charge, so a voltage dip below the cutoff threshold triggers an immediate shutdown even when the reported percentage looks safe. Running one full discharge cycle from 100% to auto-off and then charging to 100% uninterrupted recalibrates the coulomb counter and reduces false shutdowns.

BP1 reporting wrong battery percentage after cell swap

The fuel gauge IC on the BP1 stores a learned discharge curve from the old cell in firmware registers. After a cell swap, that stored curve no longer matches the new cell's actual voltage-to-capacity profile. The OS pulls percentage from that stale curve, so the number on screen can read 40% and drop to zero without warning — or read 15% while the phone still has usable charge. One full uninterrupted charge to 100%, followed by a discharge to auto-off, forces the IC to rewrite the curve against the new cell. After that cycle, percentage reporting stabilises.

Compatible Models

BP1

Technical Specifications

Voltage3.7V
Amp Hours2000mAh
Capacity2000mAh
Rate7.4Wh
Net Weight41.1g /1.45 oz
Gross Weight66g /2.33 oz
Approximate Weight66g /2.33 oz
Dimension 70.05 x 59.95 x 4.31mm

Product Highlights

  • Brand: Biackphone
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Biackphone BP1 shuts off completely at around 25% battery — is the new cell faulty?

This is a fuel gauge calibration issue, not a faulty cell. The BP1's coulomb counter inherited the discharge curve from your old, degraded battery, so the percentage it shows no longer matches actual stored charge in the new cell. Run one full discharge — let the phone shut itself off naturally — then charge uninterrupted to 100%. After that single cycle, the fuel gauge rewrites its curve and the shutdowns at 25% stop.

The Biackphone BP1 won't turn on at all after the replacement battery sat in a drawer for a few months before I installed it.

Li-ion cells in storage self-discharge slowly. If this cell dropped below roughly 2.5V before installation, the BMS has locked out charge acceptance to prevent damage to an over-discharged cell. Plug the phone into a wall charger — not a USB port — and leave it for 20–30 minutes without attempting to power it on. Most BP1 charge ICs apply a low trickle current that slowly recovers the cell voltage back above the BMS re-enable threshold, after which normal charging resumes. If the charge indicator still shows nothing after 30 minutes, try a different cable and charger to rule out a current-delivery issue before assuming the cell is unrecoverable.

The Biackphone BP1 gets noticeably warm near the battery during the first few charges — should I be concerned?

Some warmth on the first one or two charge cycles is normal with a new high-impedance cell. A fresh Li-ion cell has slightly higher internal resistance than a broken-in one, so the charge IC dissipates more energy as heat until the cell completes a few cycles and resistance drops. If the phone becomes hot to the touch or charge stops before 100%, that points to the charge IC throttling current due to a thermal trip. Charge on a hard flat surface, not a soft surface like a bed or couch that traps heat, and the temperature should normalise after the second or third full cycle.

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