SteelSeries Nimbus+ Controller Compatible Battery 3.7V 700mAh

SteelSeries Nimbus+ Controller — 3.7V Li-Polymer Replacement Battery (PL602258)

This 3.7V 700mAh Li-Polymer battery replaces the original cell in the SteelSeries Nimbus+ wireless controller. It fits models 69070, 9076SW, and 69089. Install it when the original cell no longer holds a charge or fails to power the controller through a full session.

• Nimbus+ model compatibility (69070, 9076SW, 69089): These Nimbus+ variants share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The PL602258 cell format — 61.10 x 22.00 x 5.00mm — fits all three without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Nimbus+ unit. The BMS accepted the cell without fault flags, and the protection circuit responded correctly to both low-voltage cutoff and full-charge termination events.
• Fuel gauge calibration on first use: After installing this cell, run one complete wireless play session to automatic cutoff before recharging. The Nimbus+ fuel gauge IC calibrates its empty reference point against the first full discharge cycle — skipping this step causes the indicator to read inaccurately for several sessions.

Why the Nimbus+ drops connection before the battery indicator hits empty

The Nimbus+ combines Bluetooth radio transmission with button polling at the same moment — both drawing current simultaneously. That combined load creates a brief voltage sag that the BMS reads as a low-cell event, triggering a protective disconnect before the fuel gauge has caught up. A fresh cell with low internal resistance handles the sag without tripping the BMS. If disconnects persist after install, the fuel gauge IC may still be running the old cell's discharge curve — one full calibration cycle corrects this.

Battery percentage jumping around after swapping the cell

The fuel gauge IC in the Nimbus+ learns the cell's discharge curve over the first few cycles. After a cell swap, it starts from scratch and maps the new cell's voltage profile against the old reference data — which causes the percentage to jump or stall at incorrect values. This is not a fault with the replacement cell. Run three to five complete charge and discharge cycles and the gauge will stabilise. If it still reads erratically after five cycles, reset the gauge by draining to automatic cutoff and charging uninterrupted to 4.2V.