Yes, that’s the right size. I got a 10-pack for $5 USD. No spares were in the boxes.
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We looked really hard at shipping spare boxes but had problems with shipping companies and loose batteries. There is a real issue about that. I’m not sure when shipping batteries became such an issue but we even looked at shipping batteries directly to pioneers and had a tonne of challenges that we could not circumnavigate… so there’s no issue in buying batteries direct from a supplier or Amazon … but the moment you try to put it in packaging you get the shipment stopped. 
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