Sharp PV-100TG IA3Y701C2 Compatible Battery 3.7V 1200mAh

Sharp PV-100TG — 3.7V Li-Polymer Replacement Battery (IA3Y701C2)

This 3.7V 1200mAh (4.44Wh) lithium-polymer cell replaces the OEM battery in the Sharp PV-100TG smartphone. It matches the original connector, dimensions (61.00 × 34.60 × 8.30mm), and BMS handshake requirements of the PV-100TG platform. Install it when the original cell no longer holds a usable charge across a normal day.

• PV-100TG platform fit: The PV-100TG uses a dedicated li-polymer pouch cell at 3.7V nominal with a specific connector pinout. This cell matches that voltage rail and physical form factor so the charge IC and fuel gauge IC see a compatible cell on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS accepted the charge handshake without faults and that the protection circuit triggered correctly at low-voltage cutoff — no runaway, no false full-charge flag.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current charging pushes load into an uncalibrated counter.

Sudden shutdown at 20–30% on the PV-100TG after a cell swap

The PV-100TG's fuel gauge IC retains the discharge curve from the old cell in memory. A fresh cell has a different voltage-versus-capacity slope, so the IC misreads the actual state of charge. When the modem transmits or the screen peaks in brightness, current draw spikes and the new cell's voltage drops faster than the IC predicted. The phone interprets this as a hard undervoltage event and shuts down — even though the displayed percentage still showed 20–30%. Run one full uninterrupted discharge to 0% and a full charge to 100% without interruption; this forces the coulomb counter to reset its reference points against the new cell.

PV-100TG not powering on after sitting in storage with a flat battery

If the original cell drained below approximately 2.5V during storage, the BMS protection circuit trips into lockout mode and blocks all current flow — including the charge current needed to recover the cell. Plugging in a standard charger shows nothing on screen because the battery cannot accept charge in this state. Connect the phone to a charger and leave it for at least 20–30 minutes without pressing the power button; some charge ICs deliver a trickle pre-charge pulse that slowly raises cell voltage above the BMS re-enable threshold of around 2.8–3.0V. Once the screen shows a charge indicator, proceed with a full charge before first use.