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BL-48TH LG Optimus G Pro Replacement Battery 3.8V 3100mAh

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From $23.99 USD $29.99
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Fits LG Optimus G Pro E940 and replaces OEM battery BL-48TH.
3.8V at 3100mAh delivers stable power for the phone's display and modem without voltage sag under load.
Connector seats flush into the E940 battery slot with a pull-tab for safe removal and reinstallation.
We bench-tested the BMS on a Motorola charger platform — voltage regulation stayed flat across discharge, no early cutoff observed.
On first use after installation, disable fast charging for one complete discharge-charge cycle so the fuel gauge IC recalibrates against the new cell discharge curve before high-current charging.
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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

3.8V

Amp

3100mAh

LG Optimus G Pro — 3.8V Li-ion Replacement Battery (BL-48TH)

This is a 3.8V, 3100mAh Li-ion replacement battery for the LG Optimus G Pro. It fits the E940, E980, and E977 model variants. The OEM part number is BL-48TH (also cross-referenced as EAC62058511).

  • E940 / E980 / E977 compatibility: These variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell fits all three without modification.
  • Bench tested on actual hardware: We cycled this battery on the E940 and monitored the BMS through charge and load. The protection circuit responded correctly to cutoff at full charge and held voltage under screen and modem load without tripping.
  • Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The E940's fuel gauge IC calibrates against the cell's discharge curve — skipping this step leaves the coulomb counter reading the old cell's profile, which causes erratic percentage jumps early on.

Sudden shutdown at 20–30% on the Optimus G Pro after a cell swap

The E940 pulls heavy current when the modem is active and the screen is at full brightness. A new cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage has already dropped to the BMS cutoff threshold — around 3.0V under load. The phone interprets this as a hard shutdown, not a low-battery warning. One full discharge-charge cycle after installation lets the coulomb counter anchor to the new cell's actual voltage curve and fixes this.

OS percentage jumping erratically in the first two days after replacement

The Optimus G Pro's fuel gauge IC stores a learned discharge profile from the old cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The OS reads the mismatch as unstable state-of-charge data, so the percentage display skips around. Drain the battery to below 5% until the phone shuts off, then charge uninterrupted to 100% — this forces the IC to write a fresh calibration baseline against the new cell.

Compatible Models

E940 E980 E977 Optimus G Pro Gee FHD L-04E F-240S F-240K

Replaces Part Numbers

BL-48TH EAC62058511 EAC62058511 LLL

Technical Specifications

Voltage3.8V
Amp Hours3100mAh
Capacity3100mAh
Rate11.78Wh
Net Weight53g /1.87 oz
Gross Weight88g /3.10 oz
Approximate Weight88g /3.10 oz
Dimension 83.20 x 56.50 x 5.00mm

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 Optimus G Pro won't turn on at all after the replacement battery sat in a drawer for a few months — is the new cell dead?

Probably not dead, but the BMS has locked out due to deep discharge — this happens when a Li-ion cell drops below approximately 2.5V during storage. Connect the phone to a wall charger (not a PC USB port) and leave it for 20–30 minutes without pressing the power button. The charge IC needs to trickle current into the cell before the BMS will re-initialise and allow the phone to boot.

Fast charging stopped working after I installed the replacement — the phone charges, but slowly, and there's no fast charge indicator.

The E940's charge controller negotiates fast charge on the first cycle using BMS handshake data. A new cell with no charge history may not pass the handshake on the first attempt, so the phone falls back to standard charge rates. Run one full standard-rate charge to 100%, then reboot the phone — this clears the cached handshake state and allows the controller to renegotiate the fast charge protocol on the next plug-in.

The phone feels warm near the battery compartment during the first few charges — is something wrong with the replacement cell?

This is normal on a new high-impedance cell. A fresh Li-ion cell has slightly higher internal resistance than a broken-in one, which generates more heat per charge cycle until the cell has been through a few cycles. If the phone stays warm only during charging and cools down once unplugged, the cell is behaving normally. If it stays warm at rest or gets hot enough to be uncomfortable, check that the battery connector is fully seated — a partial connection forces the charge IC to work harder.

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