Mobistel EL560 Replacement Battery BTY26171 3.7V 1100mAh

Mobistel EL560 / EL560 Dual — 3.7V Li-ion Replacement Battery (BTY26171)

This is a 3.7V, 1100mAh Li-ion cell replacing OEM part BTY26171 in the Mobistel EL560 and EL560 Dual smartphones. It slots directly into the original battery bay and connects to the same three-contact BMS interface. Dimensions are 57.24 × 48.44 × 4.01mm — verify your original cell matches before ordering.

• EL560 and EL560 Dual compatibility: Both variants share the same battery bay geometry, connector pinout, and BMS communication protocol, so one cell SKU covers both. The dual-SIM model draws slightly higher standby current from the second radio, but the charge IC and cutoff thresholds are identical.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the EL560 platform. The BMS accepted the handshake on the first cycle, charge termination triggered correctly at 4.2V, and low-voltage cutoff held at 3.0V under a simulated modem-load discharge.
• First-cycle fuel gauge recalibration: On first use after installation, disable fast charging if your charger supports it and run one complete discharge-to-charge cycle. This gives the fuel gauge IC a clean reference curve against the new cell before high-current charging begins pushing current into an uncalibrated state.

Sudden shutdown at 20–30% on the EL560 after a cell swap

A new cell has a slightly different voltage-versus-capacity curve than the aged cell the fuel gauge IC was calibrated to. When the phone hits the modem transmit load or screen brightness peak, the cell voltage drops sharply below the OS shutdown threshold — even though the reported percentage still looks safe. The fuel gauge IC reads that voltage cliff as a hard cutoff and kills the system. One full discharge-charge cycle resets the coulomb counter and maps the new cell's actual curve, which pushes the cliff back to its correct position below 5%.

Phone not powering on after the replacement cell sat in storage

Li-ion cells self-discharge in storage, and if this cell dropped below roughly 2.5V before installation, the BMS will have entered lockout mode to prevent damage to the cell chemistry. The phone will show no response — no charging animation, no vibration. Connect the device to a wall charger, not a USB port, and leave it for 15–20 minutes. The charge IC trickle-charges the cell back above the BMS re-enable threshold of approximately 2.9V, after which normal charging resumes.