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power tool battery pack - $40 (Surrey)
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* 21V Lithium-ion
* 4000mAh (4.0Ah)
it’s a rechargeable lithium-ion battery used for cordless tools like drills, impact drivers, or saws
* Slides into a cordless tool
* Provides portable power (no cord needed)
* 4.0Ah = decent capacity → longer runtime