Original Blade VEC 4G Replacement Battery 3.8V 2300mAh

Original Blade VEC 4G / Rono — 3.8V Li-Polymer Replacement Battery

This is a 3.8V, 2300mAh Li-Polymer cell for the ZTE Blade VEC 4G and Rono smartphones. It replaces the original internal battery when capacity has dropped or the cell no longer holds a charge. Dimensions are 104.91 × 42.35 × 4.55mm — confirm clearance before fitting.

• Blade VEC 4G and Rono compatibility: Both devices run the same battery bay dimensions and voltage rail. The connector pinout, BMS handshake protocol, and charge termination voltage are identical across the two models, so one cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Blade VEC 4G platform. The BMS accepted the charge IC handshake cleanly, hit full termination voltage without error flags, and sustained voltage under display and modem load without dropping below the protection threshold.
• 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 map the new cell's discharge curve before high-current charging runs into an uncalibrated coulomb counter.

Sudden shutdown at 20–30% on the Blade VEC 4G after a cell swap

This is a voltage cliff issue, not a capacity fault. When the modem transmits or the screen peaks brightness, current draw spikes sharply. A new cell that hasn't been calibrated to the fuel gauge IC can't communicate its true state-of-charge, so the phone sees a voltage dip and interprets it as empty. The fix is one full discharge-to-cutoff and uninterrupted charge cycle without fast charging enabled. After that cycle, the coulomb counter has a real baseline and the shutdowns stop.

Phone warm near the battery during the first charge after replacement

A freshly installed Li-Polymer cell has higher internal impedance than a cell that's been through several cycles. The charge IC pushes current into that resistance, and some of that energy converts to heat rather than stored charge. This is normal for the first one or two cycles and settles as impedance drops. If the device is still noticeably warm after three full charge cycles, check that the charge IC hasn't defaulted to a fast-charge profile — keep it at standard charge rates until the cell is broken in.