BTY26174 Mobistel EL530 Replacement Battery 3.7V 950mAh

Mobistel EL530 / EL530 Dual — 3.7V Li-ion Replacement Battery (BTY26174)

This is a 3.7V, 950mAh (3.52Wh) Li-ion cell replacing the original BTY26174 in the Mobistel EL530 and EL530 Dual smartphones. It fits both single-SIM and dual-SIM variants of the EL530 — same footprint at 59.87 × 38.05 × 4.40mm, same connector orientation. Swap it when the original cell can no longer hold a charge through a normal day of calls and messaging.

• EL530 and EL530 Dual compatibility: Both variants use the same battery bay dimensions and the same BTY26174 cell. The dual-SIM model draws slightly more standby current due to the second radio, but the battery connector, BMS handshake, and physical slot are identical across both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the EL530 platform and confirmed the BMS communicates correctly with the phone's charge IC — no false full readings at the top of charge, no premature cutoff during discharge.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge adapter for the first full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter — which is what causes erratic percentage readings early on.

Sudden shutdown at 20–30% on the EL530 after a cell swap

The EL530's fuel gauge IC stores a discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-versus-capacity relationship of the replacement. The phone reads 25% state-of-charge but the cell is already at or below the modem load threshold — around 3.5V under GSM transmission burst — and the hardware cuts power to protect the new cell. One complete slow-charge cycle forces the IC to relearn the new curve and resolves the cliff. Charge to 100% with a standard 5V/1A adapter, then allow the phone to discharge naturally to auto-shutdown before recharging.

EL530 not powering on after the replacement battery sat in storage

Li-ion cells shipped or stored without charge can drop below 3.0V per cell, which triggers the BMS into lockout mode — a protective state that blocks normal charge current to prevent damage to a deeply discharged cell. The phone shows no charging indicator and will not boot. Connect the phone to a 5V USB charger and leave it completely undisturbed for 20–30 minutes — most BMS circuits include a trickle-recovery path at around 50–100mA that slowly raises cell voltage back above the 3.0V re-enable threshold. Once the charging LED activates, normal charging has resumed.