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Spare batteries for the tracker was the one additional thing I wish I'd taken.
Even though I didn't need them.
Yes, I'd always carry them: tiny and weigh nothing. But nice not to have to faff around actually changing them
The other difference I remember is that with Gen 3 you don't need a screwdriver to open them. I carry one anyway on my multi-tool but it might save you having to carry an additional tool if you weren't planning to.
Spare batteries for the tracker was the one additional thing I wish I'd taken.
Even though I didn't need them.