TP-Link Neffos C5A Compatible Battery 3.8V 2200mAh NBL-43A2300

TP-Link Neffos C5A / TP703A — 3.8V Li-ion Replacement Battery (NBL-43A2300)

This is a 3.8V, 2200mAh (8.36Wh) Li-ion cell replacing OEM part NBL-43A2300. It fits the Neffos C5A, Neffos C5A Dual SIM, and TP703A. If your C5A shuts down unexpectedly, won't hold a charge, or no longer boots, this cell restores normal operation.

• C5A and TP703A platform fit: The C5A and TP703A share the same battery bay dimensions, connector pin-out, and BMS handshake protocol. One cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a C5A unit. The BMS accepted charge input on first connection, voltage held steady at 3.8V nominal, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging for one complete discharge-to-charge cycle. The fuel gauge IC on the C5A is calibrated to the old cell's discharge curve. Running one full cycle at standard current lets the coulomb counter re-anchor to the new cell before higher charge rates are applied.

Sudden shutdown at 20–30% on the Neffos C5A after a cell swap

This is a voltage cliff issue, not a capacity problem. When the modem transmits or the screen brightness peaks, current draw spikes and the new cell's voltage drops sharply before the fuel gauge expects it. The phone's low-voltage protection then cuts power even though the displayed percentage still reads above zero. One full discharge-charge cycle without fast charging lets the fuel gauge IC remap the actual voltage curve of the new cell, and the early shutdowns stop.

Phone warm near the battery during the first few charges after replacement

A new cell starts with higher internal impedance than a broken-in one. The charge IC pushes current into that resistance, and some of the energy converts to heat rather than stored capacity. This is normal for the first two to three cycles and settles as impedance drops. If the phone stays warm beyond the fifth full charge, check that fast charging is actually disabled — running the standard 5V/1A input is the right call until the cell is broken in.