Nokia HE402 5710 Replacement Battery 3.7V 1100mAh

Nokia 5710 XA DS — 3.7V Li-ion Replacement Battery (HE402)

This is a 3.7V, 1100mAh Li-ion battery replacing the Nokia HE402 cell used in the Nokia 5710, 5710 XA DS, and TA-1482. It fits the original housing without modification and connects via the same contact array as the OEM unit. Swap takes under five minutes with a plastic pry tool.

• 5710 / TA-1482 / 5710 XA DS compatibility: All three variants share the same physical footprint, contact pitch, and BMS handshake protocol, so one cell covers the full 5710 lineup. Voltage and connector position are identical across the TA-1482 and XA DS board revisions.
• Bench tested on actual hardware: We ran this cell on a TA-1482 unit and monitored BMS communication through full charge and discharge cycles. The protection circuit engaged cleanly at both the low-voltage cutoff and high-voltage ceiling — no false trips or thermal flags during the test.
• Fuel gauge recalibration on first use: On the Nokia 5710, disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC is still referencing the old cell's discharge curve, and letting it run one uninterrupted cycle at standard current gives the coulomb counter accurate baseline data before any high-current charging session.

Sudden shutdown at 20–30% on the Nokia 5710 after a cell swap

This happens because the fuel gauge IC is still using the discharge curve from the original degraded cell. When the new cell hits a voltage region the old curve maps to 20–30%, the phone's power manager may read a voltage drop under modem or display load as a critical low and force shutdown. The new cell still has usable charge — the OS just doesn't know it yet. One full discharge down to automatic cutoff, followed by a full charge, resets the coulomb counter and aligns the percentage readout to the new cell's actual curve.

Nokia 5710 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge during storage, and if the voltage drops below approximately 2.5V per cell, the BMS locks out to prevent damage. The phone will show no response — no boot logo, no charging indicator — even when plugged in. Connect the phone to a wall charger rather than a PC USB port, which delivers more consistent 5V current to the charge IC. Leave it on charge for 20–30 minutes before attempting to power on; the charge IC needs to trickle enough current through the BMS lockout threshold before normal charging resumes.