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Three months without a charge is too long for any motorcycle battery. It will greatly shorten the life. DON'T use a conventional charger, though, especially if you're going to leave it plugged in that whole time! Use a battery tender that goes to float mode (not the same thing as trickle charge) when the battery is topped up.
Running the tank dry--not the greatest idea for a fuel injected bike, and even less so where a catalytic converter is involved. Use fuel stabilizer and run the bike enough to get stabilized fuel to the injectors. That'll be fine for three months. Drain the tank by means of pump or siphon if you don't want to leave fuel in it, but don't run it dry.
Oil change--that's a little tougher call. Three hundred miles since the last change isn't a lot, but in that short distance the clock has started running on the acid-neutralizing additives in the oil, and it has already taken on some moisture and other assorted combustion byproducts. If it were me, I'd err on the conservative side and change it again, but that's up to you; opinions may vary quite a bit on this.
As for other prep, winter and summer storage are not that different. Whether you should coat anything or not will depend on your humidity level. (Oil would not be my choice of a preservative, though.) If humidity IS a factor, then also tie or tape a plastic bag over the silencers. Triumph recommends a few drops of oil in each cylinder before storage, too.
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John
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