Harbor Freight Tools


40V 2.5 Ah Lithium Battery

Full Line of ATLAS Tools
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This powerful, fade-free 40V battery delivers 2X the power** and runtime*. It supports 40V ATLAS™ cordless tools.

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RYOBI OP4020A at $139 Save $59.01

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The ATLAS™ 40v battery platform performs better than gas - no dangerous fumes, no gas and oil mixing, no engine maintenance. The 40V battery delivers 2X the power and runtime. Designed for rapid charging, this battery has a built-in fuel gauge that displays remaining power.

  • Powers all ATLAS™ 40V tools
  • Fuel gauge displays state of charge
  • Rapid charge time
  • Industry leading quality Li-ion battery cells individually balanced and tested to meet the highest performance requirements
  • Thermal control extends life and runtime by minimizing heat
  • Impact resistance prevents failure from drops and vibration

Important Information

  • Battery only, requires ATLAS™ 40/80V Dual Voltage Battery Charger or Rapid Charger, sold separately. * Compared to BAUER 20V battery, **compared to standard 20V outdoor power equipment. This item can only be shipped within the 48 contiguous states via Standard Ground Shipping.

Battery capacity
2.5 Ah
Battery type
Battery voltage (volts)
Charge time
30 minute rapid charge time
Shipping Weight
1.71 lb.
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.