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I had 5 ah before and they're solid. With 8" bit I bet you'd get 30ish holes in 2ft of ice on one 5ah, just have to keep the blades sharp. More holes than i ever need but for $100 I couldn't pass up the 9ah.
This is a little off topic but I just bought a helix 7 g3, any tips any of you guys got for using them on the ice would be appreciated 👍