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LG P970 Optimus Black Replacement Battery BL-44JN 3.7V 1500mAh

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From $23.99 USD $29.99
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Fits LG Optimus Black P970 and replaces OEM part BL-44JN battery.
3.7V and 1500mAh capacity restores full talk and standby time on the P970.
Connector slides straight down into the battery slot with no locking tab required.
We ran a full discharge-charge cycle on the bench; BMS accepted input within spec and fuel gauge began calibration against the new cell curve.
On first charge after installation, run one complete discharge-charge cycle without opening the phone to let the fuel gauge IC recalibrate against this cell's discharge curve before heavy load draws.
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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

1500mAh

LG Optimus Black P970 / VS700 — 3.7V Li-ion Replacement Battery (BL-44JN)

This is a 3.7V, 1500mAh Li-ion cell built to the BL-44JN specification. It fits the LG Optimus Black P970, VS700, P690, and over 65 additional models sharing the same connector and voltage rail. Dimensions are 64.50 × 44.40 × 4.50mm — a direct physical match to the original cell bay.

  • P970 / VS700 / P690 platform fit: These models share the same BL-44JN connector pinout and 3.7V nominal rail. The BMS handshake uses the same authentication line across the family, so one cell covers the full compatibility range without firmware conflicts.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a P970 unit. The BMS accepted the cell on first insertion, reported state-of-charge correctly, and held voltage above 3.5V through a standard screen-on load cycle.
  • Fuel gauge recalibration on first use: On first installation, disable any fast-charge setting and run one full discharge-to-charge cycle before heavy use. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes into an uncalibrated state.

Why the P970 reports wrong battery percentage after a cell swap

The P970 uses a fuel gauge IC that builds its charge model against the original cell's discharge curve over many cycles. When a new cell goes in, that stored model no longer matches the actual cell chemistry. The IC reports percentage based on stale data, so the displayed number can be off by 10–20% for the first several cycles. One full discharge from 100% to auto-shutoff, followed by an uninterrupted charge to 100%, resets the coulomb counter and brings the gauge back into alignment.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC hasn't recalibrated and the cell hits a voltage cliff under load — typically during modem activity or screen-on bursts — before the displayed percentage reaches zero. The cell voltage drops below the BMS cutoff threshold while the OS still thinks charge remains. It's not a faulty cell; it's a calibration lag. Run two full discharge-charge cycles and confirm the phone reaches 3.7V at the point the OS reports 50% — if it does, the gauge is tracking correctly again.

Compatible Models

P970 Optimus Black VS700 P690 Optimus Net Enlighten Electronics C660 Pro Optimus Sol E730 Victor C660 Pro E730 LS855 Marquee P692 Optimus Pro P699 Optimus II Gelato Optimus L3 E400 E739 Optimus L5 E610 E405 Optimus L3 Dual MS840 Optimus L1 II Dual E420 Optimus Dynamic L38c L38G AS680 Connect 4G E400F E405F E425F E435F E510 E510F E610F E612 E615 Gelato Q Hub LS700 Optimus 2 Optimus Hub L3 2 L3 II Optimus Slider Optimus White P698 Univa VM701 Optimus L3 II Dual P693 Optimus Q NTLGL55CPWP L55C AS860 Ignite Lucky Lucky 4G L16C TFLGL16C3PWP Sunrise L15G NTLGL15G3P4 Optimus Zip Optimus L75C

Replaces Part Numbers

BL-44JN EAC61679601 1ICP5/44/65

Technical Specifications

Voltage3.7V
Amp Hours1500mAh
Capacity1500mAh
Rate5.55Wh
Net Weight33g /1.16 oz
Gross Weight58g /2.05 oz
Approximate Weight58g /2.05 oz
Dimension 64.50 x 44.40 x 4.50mm

Product Highlights

  • Brand: LG
  • 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

The phone won't turn on at all after the replacement battery sat in a drawer for a few months — is it dead?

Likely not dead — the BMS locks out when cell voltage drops below roughly 2.5V during storage, cutting all output to prevent damage. Plug the phone into a wall charger and leave it for 20–30 minutes without pressing the power button; the charge IC trickle-charges the cell back above the BMS recovery threshold before normal charging resumes. Once the screen shows the charging indicator, the BMS has re-initialised. If nothing appears after 45 minutes on a known-good charger, check the cable — USB micro connections on older LG units lose contact easily.

The phone feels warm near the battery compartment during the first few charges — is that normal?

Yes, for the first two or three charge cycles. A new cell has higher internal impedance than a broken-in one, which means the charge IC dissipates slightly more heat while pushing current in. That warmth drops off as the cell cycles and impedance settles. If the back of the phone becomes hot enough to be uncomfortable — not just warm — stop charging, let it cool to room temperature, and check that nothing is running in the background driving a simultaneous heavy load through the processor.

Fast charging stopped working after I put in the new battery — the phone only slow-charges now.

On the first cycle after a cell swap, the P970's charge IC sometimes defaults to a conservative charge rate while it evaluates the new cell's impedance signature. This is normal behaviour — it's not the charger or cable. Complete one full slow charge to 100%, then do a full discharge, and reconnect to the fast charger. The charge IC rechecks the cell profile on each new session and typically resumes the higher current rate after that first calibration cycle is complete.

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