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@Stonehedge
It's because Dev chips tend to be designed to power down when voltage drops below a certain level. For example, chips designed for 3.7v tend to brown out at 3.2v as a battery drains.
If the device is designed for 3v (cut out probably around 2.4v) , then two 1.5v alkaline AAs is fine. If you use rechargeable aa, you're only providing 2.4v when fully charged so adequate power would only be supplied for a short time.
Edit: this person knows more than me https://www.quora.com/Why-does-some-electric-equipment-say-not-to-use-rechargeable-batteries