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I Have the older Ion,I too got the extra battery as I was nervious about running out of juice but that has never happened as of today and I've owned it for 5 years or so.
I tore up a shoulder and saw the 18 lb. weight on the Ion Gen 2 and decided to go that way. I have been using a Jiffy e6 for the last couple of seasons and bought a spare battery for it right away, but it seems like it has kind of been a waste of money. I have never really needed the spare except for maybe one long day that was really cold. I don't hole hop and can't see myself drilling more than maybe 30 holes a day. What are the opinions about spare batteries for these Gen 2 Ions?