About this replacement
Flymo Freestyler Cordless Shear — 3.6V Li-ion Replacement Battery
This is a 3.6V, 2400mAh Li-ion replacement battery for the Flymo Freestyler cordless shear. The Freestyler is a dual-blade handheld tool that switches between a grass trimming blade and a hedge clipping blade. One battery powers both modes, so keeping a replacement on hand matters.
- Fits Freestyler and 9668616-01: Both models share the same 3.6V single-cell architecture, connector type, and BMS communication protocol — one pack covers both.
- Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage steady under load across both blade attachments and cut off cleanly at the low-voltage threshold without requiring a manual reset.
- First charge after storage: Li-ion cells at low state of charge can trigger a false protection lockout — always run a full charge cycle before first use to let the BMS calibrate correctly.
Why cell capacity matters in a single-cell 3.6V pack
The Freestyler runs on one Li-ion cell — there is no parallel cell arrangement to buffer load spikes. At 2400mAh, the cell needs to handle the full current draw alone when cutting through thicker hedge growth. The BMS here provides overcurrent protection specifically sized for that single-cell load profile. Undercapacity cells in this format show voltage sag quickly, which the tool reads as a depleted pack.
Tool powers on but stops cutting under light load — what causes it
This is usually the BMS tripping on voltage sag, not a blade or motor fault. Aged or undercapacity cells drop below the protection threshold the moment any real cutting load is applied. The tool interprets this as an end-of-discharge condition and shuts the output. Swapping to a fresh-capacity pack at the correct 3.6V rating resolves this immediately.