If you forgot or lost the charger for your MagicBand +, it’s not a problem. You’ll still be able to use it for entry, Lightning Lane, PhotoPass, and to make purchases (if staying on property). You won’t get some of the extras, like lighting up during the fireworks or the sounds at the Fab 50 Characters. I haven’t charged my MagicBand+ in months, and I have had no issues. An uncharged MagicBand+ might not pick up the signal on ride photos, but the Bluetooth on your phone should. If you don’t receive your ride photos, just fill out the missing photos form, and Disney will do their best to find them for you.