Emporia EL400 Replacement Battery 3.7V 1500mAh BTY26170

Emporia EL400 — 3.7V Li-ion Replacement Battery (BTY26170)

This is a 3.7V 1500mAh Li-ion cell for the Emporia EL400 and Mobistel EL400 mobile phone. It replaces OEM part BTY26170 directly. If your EL400 shuts down unexpectedly or no longer holds a useful charge, this cell restores the original voltage and capacity spec.

• EL400 and Mobistel EL400 fitment: Both the Emporia-branded and Mobistel-badged EL400 share the same battery footprint, connector pinout, and BMS handshake — one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the EL400 platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.2V, and the fuel gauge IC began tracking state-of-charge without error flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it begins reporting accurate percentages. Skipping this step causes erratic percentage readings for the first few days.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under screen or modem load at a point the IC expects to be mid-charge. The phone interprets the voltage drop as a hard cutoff and shuts down. Run one full discharge cycle without fast charging — let the cell drain to automatic shutdown, then charge to 100% uninterrupted. After that cycle, the coulomb counter resets against the new cell and the shutdowns stop.

Phone won't power on after the replacement battery sat in storage

Li-ion cells self-discharge in storage. If this cell dropped below approximately 2.5V per cell before installation, the BMS enters lockout to prevent damage and the EL400 will show no sign of life. Connect the phone to a charger and leave it for 15–20 minutes before attempting to power on — the charge IC will trickle current into the cell until the BMS unlocks at a safe threshold. If the phone still does not respond after 30 minutes on charge, try a different cable and confirmed-working charger to rule out the supply before drawing any other conclusion.