NOS Novu II Replacement Battery 3.8V 2150mAh Li-ion

NOS Novu II — 3.8V Li-ion Replacement Battery

This is a 3.8V, 2150mAh Li-ion battery for the ZTE Novu II smartphone. It replaces the original cell when the phone no longer holds a charge, shuts down unexpectedly, or fails to power on after a full charge cycle. Capacity is 8.17Wh — matched to the stock specification.

• Novu II platform fit: The Novu II uses a removable cell with a three-contact connector tied to the onboard charge IC. Voltage rail, physical footprint (74.50 × 57.00 × 4.20mm), and connector orientation must all match — this cell meets those specs exactly.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Novu II platform. The BMS accepted the charge IC handshake on first connection, and voltage stayed stable through modem and screen load events without triggering a premature cutoff.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging if available and run one full discharge-charge cycle. This allows the fuel gauge IC to map the new cell's discharge curve before reporting state-of-charge to the OS — skipping this step often causes incorrect percentage readings for the first several cycles.

Sudden shutdown at 20–30% on the Novu II after a cell swap

This is a voltage cliff issue, not a capacity fault. When the modem transmits or the screen runs at full brightness, instantaneous current draw can pull cell voltage below the BMS cutoff threshold — even when the fuel gauge still shows charge remaining. A new cell with an uncalibrated fuel gauge IC compounds this because the OS is reading a curve mapped to the old cell. Run one full discharge-charge cycle without fast charging. After calibration, the fuel gauge tracks actual cell voltage more accurately and the shutdowns typically stop.

Phone warm near the battery slot during the first charge after replacement

A new cell has higher internal impedance than a conditioned one. The charge IC pushes current into that higher impedance, which generates more heat than usual during the first few cycles. This is expected behaviour and not a fault with the cell or the phone. Warmth should reduce noticeably after two or three full cycles as impedance drops. If the phone remains hot to the touch after five cycles, check that the replacement cell dimensions — particularly the 4.20mm thickness — match the original, as a swollen or oversized cell will trap heat against the chassis.