Casio F-B100W

Long-term owners

battery life is reasonably good (2 years) even with Bluetooth sync feature

Aug 2026 · comment

It's almost unbelievable that a step-tracker can have 2 years battery.

Aug 2026 · comment

Approx. battery life: 2 years on CR2016

Aug 2026 · comment

What hackers pick instead

• Casio watchPeople recommend Casio digital watches for battery life measured in years, low price and simple, durable use. Critics say the backlight is weak and the interface is hard to use.49recommend
• Casio F-91WCheap, simple, and durable digital watch that often runs for years on one battery, with a strong mod community. Critics say the backlight is weak and the strap is small.47recommend
• Casio G-ShockPeople recommend it for accurate, durable, low-maintenance timekeeping and good value for the price. The most common caveat is that it is bulky.43recommend
• Casio Wave CeptorPeople recommend it for a solar, radio-controlled titanium watch that never needs batteries or setting and keeps accurate time.5recommend
• Casio F-105WA successor to the F-91W that people prefer for its better backlight over the older Illuminator model. The most common caveat is a lower-contrast display that is harder to read in daylight.5recommend

Every quote

The 40 most detailed of 69 comments. Each links to the original.

1. has a long battery life. Unfortunately, their app is horrible, only works after signing up for an account

   Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

2. I do appreciate the way they implemented them, with a focus on longevity and simplicity

   Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

3. a bluetooth watch with two years of battery life doesn't sound like a bad idea really

   Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

4. I love the simplicity but I don't like all the text outside the watch itself

   Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

5. battery life is reasonably good (2 years) even with Bluetooth sync feature

   Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

6. if it had vibration alarm and notification, which it doesn't unfortunately

   Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

7. As a full package in the classic design it would make a great alternative

   Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

8. I love the anesthetics of a Casio but hate how the face has so much text.

   Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

9. It's almost unbelievable that a step-tracker can have 2 years battery.

   Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

10. shame it doesn't have notifications, otherwise it would be perfect

    Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

11. find my phone is helpful, the watch always has the correct time

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

12. you don't have to manually convert from 24h to 12h time

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

13. It adds to the charm, to be realized in a few decades.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

14. I think that makes it a much more interesting device.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

15. That's an amazing battery life these days.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

16. charming retro tech with modern features

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

17. Approx. battery life: 2 years on CR2016

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

18. Some of my favorite purchases ever.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

19. I still like them for what they are

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

20. mine only lasts a week or so now

    Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

21. but 2 years is unbelievable

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

22. wow 2y battery w/ CR2016!

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

23. It's blatantly illegal - overprocessing of PII - to require registration for connecting two devices owned by the same person

    Criticizes · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

24. the actual area dedicated to showing the time is overwhelmed by superfluous elements

    Criticizes · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

25. the stated 2yr battery life is kind of meh in comparison to the F-91W

    Criticizes · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

26. You cannot connect the watch to Bluetooth without a proprietary app

    Criticizes · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

27. I wish they would've added features like LED lighting and other improvements while keeping Solar and Atomic clock syncing.

    Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

28. the one this whole submission is about I'd probably buy to replace my Oura ring

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

29. its the only watch I've ever used that I've stuck with and kept using

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

30. This, in the silver ABL-100WE-2AEF model, is exactly what he wants.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

31. At night it is more than sufficient. I even use it as a flashlight

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

32. I really like this because the ABL-100WE comes with metal bands

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

33. I'd bite on something like this if the form factor wasn't off.

    Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

34. Finally some consumer tech I am excited about in a long time.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

35. this is a strange point in the functionality-vs-price space

    Mixed · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

36. Gimmie the look I want with the data backend of the phone.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

37. It looks like a cool watch, it shouldn't be held hostage.

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

38. it's a bit bigger in size, so finally wearable by adults

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

39. the ingenuity to pull this off fascinates me every day

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”

40. I use this all the time and can't live without it

    Recommends · Aug 2026 · in “New Casio F-B100W – Upgrade to the iconic F-91W after 40 years”