HE354 Nokia 9 PureView Replacement Battery 3.85V 3250mAh

Nokia 9 PureView — 3.85V Li-Polymer Replacement Battery (HE354)

This is a 3.85V, 3250mAh Li-Polymer cell built to the HE354 specification. It fits the Nokia 9 PureView across both TA-1082 and TA-1087 regional variants. Swap it in when the original cell no longer holds a charge through a full day of use.

• TA-1082 and TA-1087 fit: Both variants share the same internal chassis, connector pinout, and BMS handshake protocol — one cell covers both boards without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Nokia 9 PureView mainboard. The BMS accepted the cell on first connection, reported state-of-charge correctly after one full cycle, and thermal output during charge stayed within expected range for a high-impedance new cell.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the replacement cell

The Nokia 9 PureView uses a Snapdragon platform with an active modem and a five-lens camera array — both draw sharp current spikes. A new cell with a slightly different internal resistance curve can drop below the BMS cutoff voltage under that load, even when the fuel gauge still shows charge remaining. This is a voltage-cliff problem, not a capacity problem. Run one full discharge cycle without triggering the camera burst mode or LTE streaming, and the fuel gauge IC will recalibrate its low-voltage threshold to match the new cell.

USB-PD fast charge not activating on first cycle after replacement

After a cell swap, the charge IC on the Nokia 9 PureView defaults to standard 5V charging on the first cycle. It does this as a protective measure — the BMS has no historical data on the new cell and withholds high-current negotiation until it completes one baseline charge. Plug into a USB-PD charger and expect standard charging on that first cycle only. Fast charge will activate automatically from the second cycle onward once the BMS has logged the cell's baseline impedance.