BL-44JR Replacement Battery LG P940 3.7V 1700mAh Li-ion
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BL-44JR Replacement Battery LG P940 3.7V 1700mAh Li-ion - 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.
BL-44JR Replacement Battery LG P940 3.7V 1700mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1700mAh
LG Prada 3.0 / P940 / SU880 — 3.7V Li-ion Replacement Battery (BL-44JR)
This is a 3.7V, 1700mAh Li-ion cell built to replace the OEM BL-44JR battery in the LG Prada 3.0, P940, K2, and SU880 smartphones. The BL-44JR sits in a narrow shared platform across these LG models — same connector, same BMS handshake protocol, same physical footprint at 65.20 × 44.00 × 4.70mm. When the original cell degrades, voltage sag under screen and modem load becomes the first failure sign.
- Prada 3.0 / P940 platform fit: These models share a common power rail at 3.7V nominal and use the same BMS communication line to the charge IC. The BL-44JR connector locks to the same board header across all listed variants, so no adapter or modification is needed.
- Bench tested on actual hardware: We ran charge cycles on this cell against the P940 charge IC and confirmed the BMS negotiation completes correctly — the device registers the battery, accepts charge current, and reports state-of-charge without error flags on the first full cycle.
- Fuel gauge recalibration on first use: After installing a new cell, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on the P940 is calibrated to the old cell's discharge curve — one complete cycle lets it remap against the new cell before high-current charging begins.
Why the P940 reports the wrong battery percentage after a cell swap
The P940 uses a coulomb counter inside the fuel gauge IC that tracks charge based on the previous cell's internal resistance and discharge profile. A new BL-44JR cell has different impedance characteristics, so the IC's stored model no longer matches what it's measuring. This mismatch shows up as percentage jumps, early "low battery" warnings, or a reading that stalls at one value for extended periods. One full discharge cycle — down to auto-shutdown, then a full charge — forces the IC to relearn the new cell's curve.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC hasn't recalibrated yet and the cell hits a voltage cliff under simultaneous modem and display load. The P940's processor draws a short current spike that the uncalibrated cell can't sustain, dropping cell voltage below the BMS cutoff threshold even though the displayed percentage reads mid-range. The phone shuts down as a protection event, not a true dead cell. Run one full discharge-to-shutdown cycle, recharge to 100%, and the cutoff voltage should align with the updated fuel gauge model — typically resolving shutdowns above 3.4V per cell.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My LG Prada 3.0 powered off at 25% right after I fitted the new battery — is the cell faulty?
It is not a faulty cell. The fuel gauge IC on the Prada 3.0 is still using the discharge curve from your old BL-44JR, so it misjudges how much voltage the new cell has left under modem and screen load. When current demand spikes, the cell voltage drops below the BMS cutoff even though the gauge reads 25%. Run one full discharge to auto-shutdown, then charge uninterrupted to 100% — that single cycle resets the IC's reference curve and clears the premature cutoff.
The phone won't turn on at all after the replacement battery sat in a drawer for a few months — how do I recover it?
Li-ion cells that sit unused will self-discharge below 2.5V per cell, which triggers a BMS lockout to prevent damage. The phone will not power on from this state because the BMS blocks all output until the cell is pre-charged above the lockout threshold. Connect the phone to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. Once the charge IC pushes the cell above roughly 2.8V, the BMS will release and the phone will power on or show a charging indicator.
Fast charging stopped working on my SU880 after I replaced the BL-44JR — the phone just trickle charges now.
On the first cycle after a cell swap, the charge IC on the SU880 sometimes defaults to a low-current trickle mode because it hasn't confirmed the new cell's internal resistance profile yet. This is a safety fallback, not a permanent fault. Discharge the phone to auto-shutdown and run a full charge from a wall adapter rated at the correct output — the charge IC updates its model after that first complete cycle and typically restores full charge current on the second charge.
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