About this replacement
Shark FA200 / FlexBreeze Fan — 7.4V Li-ion Replacement Battery (FA200-2S2P)
This is a 7.4V, 4000mAh Li-ion replacement battery for the Shark FA200 and FlexBreeze portable fan. It uses OEM part number FA200-2S2P and slots directly into the fan's battery bay. When the original pack no longer holds a charge, this swap restores full cordless operation.
- FA200 and FlexBreeze compatibility: Both models run the same 7.4V two-cell architecture with an identical battery bay and connector. The BMS handshake is shared across the range, so one replacement pack covers all FA200-series fans.
- Bench tested on actual hardware: We cycled this pack through full charge and discharge on the FA200 platform. The BMS engaged correctly at both the low-voltage cutoff and the thermal limit — no false trips, no charge refusal from the charger circuit.
- First-cycle conditioning on the FA200: Run the fan at medium speed for the first charge cycle. Maximum speed pulls peak current from an uncalibrated cell and can cause the BMS to lock in conservative capacity limits that persist until the cell is properly conditioned.
Fan speed dropping before the low-battery indicator triggers
The FA200's motor controller reads speed demand, not cell voltage directly. When an aged or deeply discharged cell sags under the motor's current draw, voltage drops below the drive threshold before the indicator circuit registers it as low. The fan slows visibly while the LED still shows partial charge. This is voltage sag under load — not a fault with the replacement pack. A fresh, fully charged FA200-2S2P cell holds stable voltage across the motor's operating range and eliminates the premature drop.
New battery installed but fan won't reach maximum speed
Maximum speed on the FA200 requires the motor controller to confirm the pack is above a minimum voltage threshold before unlocking the top drive level. A new pack shipped in storage mode or partially discharged may sit just below that threshold. Charge the battery to 100% before the first run — the charger LED turning solid green confirms full charge at approximately 8.4V. Once the pack reads above the threshold, the fan's maximum speed setting becomes available immediately.