Elson EL560 Replacement Battery 3.7V 1100mAh BTY26171

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

This is a 3.7V, 1100mAh Li-ion battery for the Elson EL560 and EL560 Dual smartphones. It replaces OEM part BTY26171 when the original cell no longer holds sufficient charge for daily use. Voltage and physical dimensions match the original: 57.24 × 48.44 × 4.01mm.

• EL560 and EL560 Dual fitment: Both variants share the same battery bay dimensions, connector pinout, and 3.7V supply rail. One replacement covers either model without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted charge current correctly, and protection thresholds — over-voltage, over-current, and cell-level cutoff — triggered as expected.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging if available and run one full discharge-to-charge cycle. The EL560's fuel gauge IC is calibrated to the old cell's discharge curve. One uninterrupted cycle lets it map the new cell before reporting accurate percentages.

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

This is a voltage cliff, not a capacity fault. When the modem transmits or the screen brightness spikes, current draw rises sharply. A new cell with an uncalibrated fuel gauge IC can read 25% while the actual resting voltage is already close to the BMS low-voltage cutoff threshold. The phone shuts down before the displayed percentage reaches zero. One full discharge-charge cycle recalibrates the coulomb counter and pushes the reported percentage back in line with real cell voltage. After calibration, the cutoff should track closer to 3.2–3.3V per cell under load.

EL560 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If the cell dropped below approximately 2.5V, the BMS enters lockout mode to prevent damage and will not pass current to the device. The phone appears completely dead — no boot, no charge indicator. Connect the phone to a wall charger, not a PC port, and leave it for 15–20 minutes without pressing the power button. The charge IC needs a small trickle current to bring the cell above the BMS re-enable threshold, typically around 2.9V, before normal charging resumes.