Yes
Generally, although they may all be taken.
Yes, but normally you have to wait for 1 to come available, or if 1 is at the door, you will only be able to get so far. Most of the time I can't finish my shopping before it runs out the battery. The workers need to make sure they get plugged in. When the store is closed they all need to be charging the full time, that way they can hold the charge longer.
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