SmartFren Smartphone Replacement Battery 3.8V 2200mAh

SmartFren Smartfren — 3.8V Li-ion 2200mAh Replacement Battery

This is a 3.8V Li-ion cell rated at 2200mAh (8.36Wh), built to replace the original battery in the SmartFren Smartfren smartphone. It restores capacity lost to cell aging, swelling, or degraded cycle life. Dimensions are 81.95 × 57.70 × 4.30mm — confirm these against your existing cell before ordering.

• SmartFren Smartfren platform fit: The Smartfren line uses a 3.8V nominal Li-ion cell with a specific footprint tied to the chassis dimensions. This replacement matches that footprint and voltage rail so the charge IC and BMS communicate correctly without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a smartphone test rig. The BMS held cutoff at the expected low-voltage threshold and accepted charge current without flagging a fault on the host charge IC.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging begins on an uncalibrated counter.

Sudden shutdown at 20–30% on the replacement cell

A new Li-ion cell has a slightly different voltage-to-capacity curve than the depleted original it replaces. The phone's fuel gauge IC still uses the old curve, so it reads 25% remaining while the actual cell voltage has already dropped below the modem's minimum operating threshold. The modem or display pulls a brief high-current spike — the cell can't sustain voltage — and the phone cuts out. One full discharge-charge cycle forces the coulomb counter to re-anchor to the new cell's actual curve. After that cycle, shutdowns at partial percentage should stop.

Phone warm near the battery during the first few charges

A fresh Li-ion cell has higher internal impedance than a broken-in one. The charge IC pushes current into that resistance, and the extra impedance converts more energy to heat than usual during the first few cycles. This is normal and typically resolves within three to five charge cycles as the cell's internal resistance drops. If the device stays hot beyond cycle five or the charge IC throttles current noticeably, check that the replacement cell's dimensions match the original — an ill-fitting cell with poor thermal contact to the chassis retains heat longer.