LAMTAM E11 Replacement Battery 3.7V 1000mAh Li-ion

LAMTAM E11 / E16 / LT826 / LT828 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1000mAh Li-ion cell for the LAMTAM E11, E16, LT826, and LT828 smartphones. It replaces the original cell when capacity has faded or the battery no longer holds a charge. Dimensions are 53.00 × 33.90 × 5.70mm — verify these against your existing cell before fitting.

• E11, E16, LT826, and LT828 compatibility: These four models share the same battery bay dimensions, voltage rail, and connector layout, which is why a single cell covers the full group. No modification to the housing or connector is needed.
• Bench tested on actual hardware: We cycled this cell on an E11 unit and confirmed the BMS accepted the cell without a charge-rejection flag. Charge current ramped normally through CC and CV phases, and the phone did not report an unrecognised battery warning.
• Fuel gauge recalibration on first cycle: On first use after fitting, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before any high-current session starts.

Why the E11 reports wrong battery percentage after a cell swap

The fuel gauge IC on these phones stores a learned discharge curve from the original cell. When a new cell goes in, the IC still references the old curve, so the percentage reading drifts — often showing full charge when voltage is already dropping. This mismatch corrects itself after one complete discharge-to-charge cycle. Until the IC has recalibrated, percentage readouts are unreliable and do not reflect the actual cell state of charge.

Sudden shutdown at 20–30% on a freshly fitted cell

This happens when the modem or screen pulls a current spike that the cell cannot sustain without the voltage dropping below the BMS cutoff threshold — typically around 3.0V. The fuel gauge still shows 20–30% because it hasn't recalibrated yet, but the cell voltage collapses under load. Run one full calibration cycle first. If shutdowns continue after calibration, check that the cell contacts are fully seated and that contact resistance isn't causing additional voltage drop under load.