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Newer SEs disn't need the 7/7 mod. Unless you have some SEs that need the mod, I wouldn't worry about it.
As to longer runtime, I'm not sure standard batteries are the answer due to weight. What size were you considering? Another option if cost isn't a factor, would be LiPos, and a good charger.
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If it ain't broke, tear it apart and see what makes it tick!
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