5.0Ah Battery Replacement for SKIL 40V Battery BY8705-00 PWRCore 40 Compatible with BL4713C SM4910C PS4561C SKIL 40V Power Tools

What It Is

This is an aftermarket 5.0Ah lithium-ion battery replacement for SKIL 40V PWRCore 40 tools and equipment, including lawn mowers, string trimmers, blowers, and chainsaws. It’s designed to power compatible 40V SKIL tools where the original BY8705-00 battery has worn out or needs a spare.

Fitment & Compatibility

• OEM model: Replaces SKIL BY8705-00 (original 5.0Ah battery).
• Compatible tools: Works with SKIL 40V PWRCore 40 tools: BL4713C (blower), SM4910C (string trimmer), PS4561C (chainsaw), and mowers like the SP4640-10 or SP4641-10.
• Check before buying:
  • Physical size: Measure your original battery compartment (approx. 6.5” x 3.5” x 3.5”) to ensure this aftermarket fits snugly—some users report slight width differences.
  • Connector: Must match the SKIL 40V slide-in “PWRCore” terminal design. Do not assume compatibility with non-PWRCore 40V SKIL tools (e.g., older 20V or 24V lines).
  • Voltage: Only for 40V tools—not interchangeable with 20V or 56V systems.
• Aftermarket note: This is not OEM SKIL. It may lack the same internal cell quality or over-discharge protection. Verify your charger (SKIL QC40V or similar) is compatible—some aftermarket batteries have slightly different contact alignment.

Key Things to Know

• Performance: 5.0Ah capacity provides ~20-30 minutes of mowing on a 40V push mower (depending on grass conditions). Expect slightly shorter runtime than OEM due to cell quality variance.
• Installation: No tools needed—slide battery into tool until it clicks. Ensure the release tab locks firmly; loose fit may cause power loss during use.
• Quality concerns: Some users report the battery runs hotter than OEM, especially under heavy load (e.g., thick grass). Avoid deep discharges—recharge when the tool slows to prolong lifespan.
• Charging: Use only SKIL 40V chargers. Charging time is 2-3 hours. Do not leave on charger for days; aftermarket BMS (battery management system) may be less reliable.

Should You Buy It

Buy this if you need a budget backup battery for light to moderate yard work (e.g., trimming, blowing, or small lawn mowing) and are comfortable with slightly lower build quality than OEM. It’s a decent value for the price, but if you rely on your mower for large, frequent cuts, invest in the genuine SKIL BY8705-00 for better longevity and heat management.