Sharp XN-1BT97 SH9110 Replacement Battery 3.7V 750mAh

Sharp SH9110 Series — 3.7V Li-ion Replacement Battery (XN-1BT97)

This is a 3.7V, 750mAh Li-ion battery for the Sharp SH9110 and SH9110C smartphones. It also fits the SH6228C, SH6220C, and related Sharp handsets sharing the same connector and voltage rail. Use this when the original cell no longer holds a charge or the device shuts down unexpectedly.

• SH9110 and SH6220 series fit: These models share the same 3.7V cell form factor, contact layout, and BMS handshake protocol — the same replacement cell covers all of them without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SH9110 platform. The BMS accepted the cell, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it starts reporting accurate percentages.

Sudden shutdown at 20–30% on the SH9110 after a cell swap

The SH9110's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the stored curve no longer matches actual cell behaviour. Under screen-on or modem load, the phone hits a voltage cliff — the cell voltage drops faster than the IC expects and the device shuts off to protect the circuit. This is not a faulty battery. One full discharge and recharge cycle without fast charging forces the coulomb counter to recalibrate against the new cell. After that cycle, shutdowns at 20–30% typically stop.

Phone warm near the battery during the first few charges

A new Li-ion cell arrives with higher internal impedance than a broken-in cell. The charge IC pushes current into that higher resistance, and some energy converts to heat — this is normal for the first two to three charge cycles. If the phone feels warm but not hot, and the heat fades after a few cycles, the cell is behaving correctly. If the device becomes too hot to hold or charging stops mid-cycle, check that the charger output does not exceed the rated input voltage for the SH9110 — 5V standard input.