About this replacement
Skil PWRCore 40 Hedge Trimmer & Leaf Blower — 40V Li-ion Replacement Battery
This is a 40V, 3000mAh (120Wh) lithium-ion replacement battery for Skil's PWRCore 40 outdoor power platform. It fits cordless hedge trimmers and leaf blowers sharing the same 40V battery rail, including the 24-inch brushless hedge trimmer and the 40V 460CFM leaf blower. Part numbers BY8705-00 and BY8708C-01 identify the correct fit.
- PWRCore 40 platform compatibility: Models across this line share a common 40V connector and BMS handshake, so one battery pack serves hedge trimmers and leaf blowers without adapter hardware.
- Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage under load and released cleanly at the low-voltage cutoff without triggering false protection shutdowns.
- First-cycle conditioning for Li-ion packs: Charge fully before first use and avoid storing the pack below 20% — lithium-ion cells in outdoor tool batteries degrade faster when left deeply discharged between seasons.
Why 120Wh matters on a brushless 40V hedge trimmer
Brushless motors draw current in bursts, especially when the 24-inch blade hits dense branches at or near the 3/4-inch cutting capacity. A higher watt-hour rating means the pack sustains voltage under those spike loads rather than sagging mid-cut. At 120Wh, this pack sits at the practical threshold for sustained brushless operation without thermal rollback cutting in prematurely.
Battery not recognized by the trimmer or blower — here's the fix
If the tool shows no power after seating the pack, the BMS communication contacts are likely not making full contact. Remove the pack, wipe the gold contacts on both the battery and tool with a dry cloth, then reseat firmly until the latch clicks. If the tool still won't start, charge the pack to 100% first — some PWRCore 40 tools reject packs that arrive below a minimum charge threshold from storage.