LG Optimus G2 BL-T7 Replacement Battery 3.8V 3000mAh
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LG Optimus G2 BL-T7 Replacement Battery 3.8V 3000mAh - 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.
LG Optimus G2 BL-T7 Replacement Battery 3.8V 3000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.8V
Amp
3000mAh
LG Optimus G2 / D802TA — 3.8V Li-Polymer Replacement Battery (BL-T7)
This is a 3.8V, 3000mAh Li-Polymer replacement battery for the LG Optimus G2 and its regional variants, including the D802TA, DS1203, and G2 L-01F. It replaces the original BL-T7 cell when the existing battery no longer holds voltage under load or fails to power the device through a normal day. Capacity is 11.4Wh, matching the OEM spec.
- G2 variant compatibility: The D802TA, DS1203, and L-01F all share the same battery bay dimensions, connector pinout, and BMS handshake as the standard Optimus G2. All draw from the same 3.8V rail, so one cell covers the full family without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an Optimus G2. The BMS accepted charge current without fault, the fuel gauge IC tracked state-of-charge correctly after one full cycle, and the cell held voltage through high-draw screen-on periods without tripping the protection circuit.
- First-cycle fuel gauge reset: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC on the G2 is calibrated to the old cell's discharge curve. Giving it one full cycle against the new cell lets it rebuild its reference before high-current charging begins.
Sudden shutdown at 20–30% on the Optimus G2 after a cell swap
This is a voltage cliff issue, not a capacity fault. When the G2's modem, display, and CPU pull current simultaneously, a new cell with an uncalibrated fuel gauge can hit the BMS low-voltage cutoff before the reported percentage reaches zero. The phone shuts down because the cell voltage drops below the protection threshold under load, even though the OS still shows charge remaining. To clear it, run two full discharge-charge cycles without fast charging — this forces the coulomb counter to re-anchor its low-end voltage reference to the new cell's actual curve.
Phone warm near the battery during the first few charges after replacement
A new Li-Polymer cell typically has slightly higher internal impedance than a broken-in cell. The charge IC on the G2 pushes a fixed current rate regardless, which generates more heat across a higher-impedance cell until it cycles in. This is normal for the first three to five charge cycles and resolves as impedance drops. If the phone stays warm past cycle five or the case becomes hot to the touch, check that the replacement cell is seated flat — any flex in the pouch creates localised resistance and sustained heat.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: LG
- Manufacturer: CS
- Series: X-Longer
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Optimus G2 keeps shutting off at around 25% battery — is the new BL-T7 cell faulty?
It is not a faulty cell — it is a fuel gauge IC calibration mismatch. The G2's coulomb counter was mapped to the old cell's voltage discharge curve, so it miscalculates the low-end cutoff on a new cell. Run two full discharge cycles without fast charging enabled, and the counter will re-anchor to the new cell's actual voltage floor. After calibration, shutdowns at 20–30% stop.
The OS battery percentage is jumping around erratically after I installed the replacement battery — what is causing that?
The fuel gauge IC on the G2 stores a learned model of the old cell's charge and discharge behaviour. When a new cell goes in, the IC has no valid reference and interpolates badly, which shows up as percentage jumps of 5–15% at a time. One complete discharge to near-zero followed by a full uninterrupted charge gives the IC enough data to rebuild its curve. Percentage readouts stabilise after that first full cycle.
Fast charging stopped working after I swapped in the new battery — the phone just charges slowly now.
On the first cycle after a cell swap, the G2's charge controller can default to a reduced current rate while it verifies BMS handshake with the new cell. This is a one-cycle protective fallback, not a permanent fault. Run one full standard charge cycle to completion, then reconnect the original fast charger. If fast charging does not resume after that, check the USB port for debris — a marginal connection prevents the handshake voltage signal from completing.
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