LAMTAM E11 Smartphone Replacement Battery 3.7V 1050mAh

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

This is a 3.7V, 1050mAh (3.89Wh) Li-ion cell sourced to match the LAMTAM E11, E16, LT826, and LT828 OEM part numbers. It fits smartphones that take this battery form factor. Physical dimensions are 53.00 × 33.90 × 5.60mm — measure your original before ordering.

• E11, E16, LT826, LT828 cell group: These four part numbers share the same voltage rail, footprint, and connector pinout. A single replacement cell covers all four because the BMS handshake and charge termination voltage are identical across this group.
• Bench tested on actual hardware: We cycled this cell through charge and load discharge on a test rig. The BMS held charge termination at 4.20V and tripped the low-voltage cutoff cleanly without hanging the protection circuit.
• First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before any high-current charge session pushes current into an uncalibrated state register.

Sudden shutdown at 20–30% on the replacement cell

This happens because the phone's fuel gauge IC is still reading a discharge curve calibrated to the old, degraded cell. The new cell's voltage drops more steeply under modem or display load than the IC expects at that state-of-charge. The phone interprets the sag as a dead cell and shuts down. One full discharge cycle — running the phone down to auto-off, then charging uninterrupted to 100% — rewrites the coulomb counter baseline and eliminates the false cutoff.

USB fast charge not activating after battery swap

Some phones require the BMS on a new cell to complete at least one full trickle-to-CC charge handshake before the charge IC will negotiate a higher voltage protocol. On the first cycle, the charger may default to 5V standard charge only. This is not a fault with the cell. Charge fully once at standard rate, disconnect, then reconnect — the fast charge protocol should activate from the second session onward.