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I'm making one project for my class, some kind of smart wristband, but not sure which type of battery should I use. I found a lot of good wristband online, I see that they usually have 60 - 100mAh batteries.

Can someone tell the type of batteries used in Smart wristbands?

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Looks like smart wristbands are using lithium polymer batteries. Here are some examples.

  • Jawbone UP24 JL01-52M-US - Bluetooth 4.0 Wristband - 32 mAh Li-ion polymer
  • Xiaomi Mi Band XMSH01HM - Bluetooth 4.0 Fitness Wristband - 3.7 V, 41 mAh Li-Polymer
  • Atlas Wristband A101 - 3.7 V, 120 mAh, Li-Polymer
  • Amzer FitZer KA - Bluetooth Activity Tracker - 3.7 V, 70 mAh, Li-Polymer

References:

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As Mahendra's answer indicates just about all of the commercial smart bands use Li-something based batteries.

However if this is for a class project I'd recommend using something like a CR2032. If you buy a bulk pack then they are relatively cheap and hold about 200mAh each. For testing and development you can easily replace the battery holder with a wired connection to two AA batteries to prevent burning through too many batteries.

Your end product won't be rechargeable but as a class project you probably don't want to spend half of your time designing battery charging and monitoring circuits.

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