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Co-worker gave me a set of older (blue and yellow) Ryobi Tools. The batteries aren't in the best condition. Is it worth investing in the new lithium batteries? Can I charge them

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RYOBI 40-Volt Lithium-Ion 6.0 Ah High Capacity Battery (3-Pack) OP4060-3B - The Home Depot

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Reviews for RYOBI USB Lithium Project Kit with Rotary Tool, Inspection Light, Screwdriver, Glue Pen, (2) 2 Ah Batteries, & Charging Cable

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I have been thinking about getting some extra batteries. I currently have 2 1.5 mah batteries and 1 4 mah battery. I currently have around 20 tools. Any suggestions on the quantity