SoftBank 940SC Replacement Battery EB504465VJ 3.7V 1500mAh

SoftBank 940SC — 3.7V Li-ion Replacement Battery (EB504465VJ)

This 3.7V, 1500mAh Li-ion battery replaces the original cell in the SoftBank 940SC smartphone. It matches OEM part numbers EB504465VJ and SCBAS1. Swap it in when the original cell can no longer hold a charge through a normal day of calls, messaging, and app use.

• 940SC fit confirmation: The 940SC uses a fixed connector pinout and a BMS handshake tied to the EB504465VJ cell spec. This replacement matches that voltage rail and connector — the device powers on and charges without any firmware rejection on the units we tested.
• Bench tested on actual hardware: We ran the cell through full charge and discharge cycles on the 940SC. The BMS accepted the cell immediately, thermal behaviour during charging stayed within normal range, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration after swap: On first use after installation, disable fast charging and complete one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it starts reporting accurate percentages — skipping this step causes the OS to read percentage against the old cell's profile.

Sudden shutdown at 20–30% on a replacement cell in the 940SC

The 940SC's modem and display together pull enough current during peak load to expose a sharp voltage cliff in a new, uncalibrated cell. The fuel gauge IC reports 25% remaining, but the cell voltage drops below the BMS cutoff threshold under that load — so the phone shuts off hard. This is not a fault in the replacement cell. One complete discharge-charge cycle gives the coulomb counter accurate data on the new cell's real capacity, and the shutdowns stop after that recalibration.

Device won't power on after sitting in storage with a flat battery

If the 940SC sat unused for weeks with a depleted battery, the cell may have dropped below 2.5V — the threshold where the BMS locks out to prevent damage from charging a deeply discharged lithium cell. The phone will show no response on the charge screen. Connect it to a wall adapter rather than a USB port; a wall adapter delivers stable 5V and enough current to trigger the BMS recovery charge mode. Leave it connected for at least 20–30 minutes before attempting to power on — the BMS needs to trickle charge the cell back above 2.9V before it will allow full current flow.