Flip Ultra 2nd Generation Replacement Battery FVBPU2 2.4V 1800mAh

Flip Ultra 2nd Generation — 2.4V Ni-MH Replacement Battery (FVBPU2)

This is a 2.4V, 1800mAh Ni-MH replacement battery for the Flip Ultra 2nd Generation and Ultra HD Camcorder series, including Video Ultra U1120 and U1120P models. It replaces OEM part number FVBPU2 and fits the compact pocket camcorder battery bay directly. Capacity is 1800mAh (4.32Wh) — matching the original Flip specification.

• Ultra 2nd Generation and HD series compatibility: These models share the same 2.4V NiMH cell format, connector orientation, and physical footprint. The battery bay dimensions are 50.40 x 28.90 x 14.50mm — consistent across the Ultra and Video Ultra U1120 lineup, so the same cell fits all of them without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Flip Ultra platform. The BMS accepted the cell without rejection, charge termination triggered correctly at capacity, and voltage held stable across continuous recording draw.
• First-use charge cycle on Flip camcorders: Flip Ultra camcorders read battery state from within the camera body. Before first use, run one full charge cycle through the camera's own charging port — not a third-party external charger — so the onboard indicator calibrates to the new cell's discharge curve accurately.

Why the Flip Ultra shows a dead battery indicator on a partially charged replacement cell

The Flip Ultra does not use a fuel gauge IC — it maps battery state to a simple voltage-threshold lookup. A new NiMH cell has a slightly different resting voltage profile than a worn original, so the camera can misread charge level immediately after installation. This is not a cell defect. Running one full charge cycle through the camera body resets the threshold mapping and brings the indicator in line with actual charge state. After that first cycle, the indicator tracks accurately.

Battery percentage dropping suddenly then recovering mid-recording session

This behaviour appears when the cell voltage sags briefly under the sustained current draw of continuous video recording and then recovers once the load drops. NiMH cells show a flatter discharge curve than lithium, but voltage can dip sharply at high load if the cell is cold or not yet fully conditioned. The Flip Ultra interprets that momentary voltage dip as low battery and updates the display accordingly. Warm the camera to room temperature before recording, and complete two full charge-discharge cycles to condition the cell — resting voltage after full charge should read approximately 2.8V across the terminals.