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I'm looking for a power bank to extend the capacity of my action cam battery.

Requirements:

  • Small enough to mount on a bicycle helmet
  • Its shape fits well to bicycle helmets
  • Possible/easy to mount on a helmet
  • At least 1000mAh capacity

Nice to have features:

  • No need to power on, always on (I don't want two handle two power buttons, the one on the camera is enough)
  • Easy to mount/unmount (umount for shorter rides, or using more than one for longer rides)
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I did some research and found that most power banks (and laptop batteries) use 18650 Li-Ion batteries (cells).

So finally I bought a 18650 battery case (search for "18650 power bank case") which I'm using with a 18650 cell from a disassembled old laptop battery. Currently this one:

Product link and image source: 2600mAh 5V 1A USB Power Bank Case Charger DIY Box For iPhone

Small enough to mount on a bicycle helmet Its shape fits well to bicycle helmets

It's not perfect, but it seems to be the best option currently. Mine weights 67 grams (including battery).

Possible/easy to mount on a helmet

With self-adhesive velcro it works fine.

At least 1000mAh capacity

18650 batteries usually have 2600+mAh capacity.

No need to power on, always on (I don't want two handle two power buttons, the one on the camera is enough)

I have not tested it thoughtfully but mine does not have any power button and seems fine.

Easy to mount/unmount (unmount for shorter rides, or using more than one for longer rides)

Velcro solves that.

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