TP-Link Neffos C5 Replacement Battery 3.8V 1700mAh NBL-42A2200

TP-Link Neffos C5 / TP701A — 3.8V Li-ion Replacement Battery (NBL-42A2200 / NBL-42A2280)

This is a 3.8V, 1700mAh (6.46Wh) Li-ion battery for the TP-Link Neffos C5, Neffos C5 LTE Dual SIM, and TP701A smartphones. It replaces OEM part numbers NBL-42A2200 and NBL-42A2280. If your original cell no longer holds a charge or the phone shuts down unexpectedly, this is a direct cell swap.

• Neffos C5 / TP701A platform fit: The Neffos C5, C5 LTE Dual SIM, and TP701A share the same battery bay dimensions, connector pinout, and charge IC communication protocol — all three accept this cell without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Neffos C5 platform. The BMS handshake completed correctly, charge IC accepted the cell without error flags, and voltage held stable at load across display and modem activity.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC begins pushing higher current — skipping this step causes erratic percentage readings for several days.

Sudden shutdown at 20–30% on the Neffos C5 after a cell swap

This happens because the fuel gauge IC is still using the discharge curve it mapped from the old, degraded cell. The new cell has a steeper voltage drop under modem and display load than the IC expects at that state-of-charge. When the cell voltage dips below the BMS cutoff threshold — typically around 3.2V under load — the phone shuts off even though the displayed percentage suggests capacity remains. One full discharge-charge cycle at standard rate recalibrates the coulomb counter to the new cell's actual curve, and the shutdowns stop.

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

A new cell has higher internal impedance than a broken-in cell. During the first two to three charge cycles, the charge IC works harder to push current into that higher-resistance cell, generating more heat than usual at the battery contact area. This is a normal break-in effect and not a fault. If warmth persists beyond the third full charge, check that the phone's charge IC has not logged an error — power off, remove the battery for 30 seconds, reinsert, and charge again from below 10%.