Just make sure they're active. One thing thats a slight bummer is cannot use them to buy points at resort arcades but thats life. They will work for purchases and tapping into rides. But they won't link the ride photos that don't have a touch point.
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It is perfectly acceptable to reuse an old MagicBand on your next trip. The official word from Walt Disney World is that the battery life of a band is expected to be about 2 years. However, I personally have older ones that are still going strong! So, bring your MagicBands and try it!
Under all of your MagicBands you are going to see the option to Activate/Deactivate depending on the status and the option to Report Lost. If your MagicBand is currently deactivated, you'll just select the Activate button and it will be good to go.
REUSE THEMIf you've customized one of your bands or grown partial to a special edition band you purchased, you can reuse a band from a previous trip. Generally, the battery life of MagicBands is between 2-5 years, though the MagicBand+ may last longer because they are rechargeable.
However, even if the long-range battery is no longer working, your MagicBand should still work for any Mickey to Mickey touchpoints, such as entrance tapstyles, Lightning Lane entrances, unlocking the door to your Disney Resort Hotel room, or point of sale terminals when charging purchases to your hotel room folio.
If you aren't sure whether or not to budget them for your vacation, we say…go for it! MagicBand is one of those rare add-ons that makes a big difference regarding ease and convenience on a trip that can sometimes be overwhelming.
My 4 and 2 year old are currently wearing magic bangs and love them. My 4 year old runs to open the door to the room and the 2 year old “checks in” to every ride and park entrance. For $10/$20, it's worth it.