LG Transpyre BL-41A1H Replacement Battery 3.8V 2000mAh

LG Transpyre / VS810 / LS660 — 3.8V Li-ion Replacement Battery (BL-41A1H)

This is a 3.8V, 2000mAh Li-ion cell built to fit the LG Transpyre, VS810, VS810PP, and LS660 smartphones, along with ten additional LG variants sharing the same battery bay. It replaces OEM part BL-41A1H (also listed as EAC62638301). Install it when the original cell no longer holds a charge or causes unexpected shutdowns.

• VS810 / LS660 platform compatibility: These models share the same 3.8V nominal rail, connector pinout, and BMS handshake protocol. One cell covers the full variant range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on VS810 hardware. The BMS accepted the charge handshake cleanly, and protection circuits tripped correctly at low-voltage cutoff — no false triggers during normal load.
• 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 build an accurate discharge curve against the new cell before high-current charging begins on an uncalibrated state-of-charge register.

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

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell hits a voltage cliff under modem or screen load, the phone reads 25% but the actual cell voltage drops below the shutdown threshold instantly. The OS has no time to react. One full discharge-charge cycle forces the coulomb counter to remap against the new cell's actual voltage curve, and the shutdowns stop.

Phone warm near the battery during first charge after replacement

A fresh cell arrives with higher internal impedance than a broken-in one. During the first charge cycle, the charge IC pushes current into a cell that hasn't yet settled its impedance, which generates slightly more heat than normal. This is expected and typically resolves after one or two full cycles. If the phone stays warm past the second charge or the charger cuts off early, check that the USB cable and adapter are delivering stable voltage — a resistive cable raises charge IC temperature independently of the cell.