Vodafone 1230 Li-ion Replacement Battery 3.7V 900mAh

Vodafone 1230 / V1230 — 3.7V Li-ion Replacement Battery (Li3710T42P3h483757)

This is a 3.7V, 900mAh Li-ion replacement battery for the Vodafone 1230 and V1230 mobile phones. It carries OEM part number Li3710T42P3h483757 and slots directly into the original battery compartment. Swap it in when the original cell can no longer hold enough charge to get through a day of normal use.

• 1230 and V1230 compatibility: Both model designations share the same PCB layout, connector pinout, and BMS handshake protocol — one cell covers both. The same 47.67 × 37.27 × 5.80mm footprint fits either variant without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a 1230 unit. The BMS accepted the charge current without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold before cell damage could occur.
• Fuel gauge recalibration on first cycle: After installing this battery, disable fast charging and run one complete discharge-to-charge cycle before normal use. The fuel gauge IC on the 1230 calibrates its discharge curve against the new cell on that first cycle — skipping this step leaves the coulomb counter reading against the old cell's aged curve, which causes erratic percentage jumps early on.

Sudden shutdown at 20–30% on the Vodafone 1230

This is one of the most common complaints after a cell swap on the 1230. The fuel gauge IC still holds calibration data from the old, degraded cell — so when it reports 25%, the actual voltage may already be near the BMS cutoff threshold. Under modem transmission load or screen brightness spikes, the cell cannot sustain voltage, and the BMS trips the circuit before the OS can log a low-battery warning. Run one full uninterrupted discharge cycle to let the coulomb counter reset against the new cell's actual discharge curve. After that cycle, shutdowns at mid-percentage should stop.

Phone warm near the battery slot during the first few charges

A new Li-ion cell has higher internal impedance than a well-conditioned one — the charge IC dissipates more energy as heat while pushing current into it during the first two or three cycles. This is normal and temporary. If the phone stays warm past the fifth charge cycle, check that the back cover is fully seated and not trapping heat against the cell. Warmth that persists beyond early cycling, or that appears at the top of the phone rather than the battery slot, points to the charge IC rather than the cell itself.