Casio EFV 100D Battery Change

[@SerArtemoff]

I usually stick a piece of thick tape on the back cover before unscrewing it with any tool. This prevents the back cover from being scratched if the tool comes off.

[@JustWatches1]

This is a good trick!

[@Joe-hl2ts]

Online images do not do this watch any Justice, it looks great!

[@JustWatches1]

Agree, this watch will make you question the entire hobby.

[@ianmaw66]

Good video, thanks. Bergeon sell a set of three carbon fibre tweezers quite cheaply. They are quite brittle though. Cousins UK also sells various tweezers with carbon fibre tips. It might be worth applying more silicon grease to the gasket before refitting it. You can get little pots which apply just the right amount easily.

[@JustWatches1]

Thanks for the tip! I really need to get a few tweezers that are not metal. Yeah, that is a good idea on the grease too, I have some, but I need to get the little applicator you are talking about because right now it is very difficult to apply haha

[@kucko-macko]

I have the white version and I really love it.

[@JustWatches1]

Awesome, glad you are enjoying it!

[@tryura]

I replaced a battery in the smaller version of this watch today (EFV-110d). It was very difficult for me to fit the white plastic retention ring back, but then after some tweaking I discovered that it's much easier to do it if the crown is unscrewed. Maybe someone will find it helpful.

[@JustWatches1]

Thank you for the tip, that is helpful to know! Glad you got it changed :)

[@andrewshadowy2025]

Hi is it the same battery for the smaller version too? as I have this watch. Thank You

[@tryura]

@@andrewshadowy2025 Hello! No, it seems to be a different one. The bigger model has SR927SW (can be seen at 8:29), the smaller one has SR920SW. They're different in thickness, make sure to order the correct one.

[@mbrijun]

That was my experience as well. Thank you for sharing.

[@stratpaul]

​@@tryurawhat brands are good for batteries. I found Renata batteries. Are they a good brand?

[@andrewshadowy2025]

This is my fav watch and now it’s time for me to change the battery in mine. Did you notice before the battery died your watch losing time about 10 mins or so? Mine is still going but losing time and so think I now need to change it’s battery?

[@JustWatches1]

Yes that is exactly what happened to mine. It started losing big chunks of time. I switches the battery and everything was back to normal :)

[@silentthunder890]

Great video. Any chance of some more shots of it on this band? I'm toying with the idea of the same combo and not sure if it's right for me. Thanks!

[@JustWatches1]

Sure, I can try to get some pics of it and link them.

[@silentthunder890]

@@JustWatches1 thanks, much appreciated!

[@JustWatches1]

@@silentthunder890 m.imgur.com/a/2L2JJCw

[@silentthunder890]

@@JustWatches1 thank you so much, looks amazing. I think I'm gonna go for it!

[@Conundrum191]

Although I've used the same tool to open and close a watch, in some cases a tennis ball or rubber ball off Amazon works too, and doesn't really risk scratching the case.

[@JustWatches1]

Yes, I have seen people use a ball - I need to get one of those rubber ones! Thanks for the tip :)

[@THunt-ss4hy]

How long have you had it? Watch hasn’t been released that long?

[@JustWatches1]

I got this watch in September 2019. The battery is supposed to last ~3 years, not sure why it died so soon!

[@THunt-ss4hy]

@@JustWatches1 Weird. I guess if it rolled off the assembly line in March 2019 that would be accurate for their 3 year estimate. No sweat though, 10-15 minutes every few years to change a battery is no big deal.

[@mbrijun]

In my experience, it is critically important to unscrew the crown before removing the plastic padding ring. Otherwise the spring on the stem will push the dial to one side, making it difficult to remove and reinsert the ring. It was not obvious to me at first and it took some time to figure this out.

[@JustWatches1]

Thanks for the insight. I’m new to this stuff for sure!

[@suman5492]

Is it a Miyota movement or Casio in-house quartz movement?

[@event4216]

Miyota. Casio in-house movements are those 10-year battery ones, tough solar and digital watch movements - as far as I know.

[@bendeguzszabo9839]

I dont know if you see this, but is this watch still good in 2023 in this price range?

[@JustWatches1]

They went up in price quite a bit but if you can find one for $100 or less it’s a really phenomenal watch. Honestly I should just own this one watch and be done with the hobby 😝

[@happyjason123]

where did you buy the watch straps?

[@JustWatches1]

That is a Barton silicon elite. A great strap at a great price and it comes in a ton of colors: www.bartonwatchbands.com/collections/elite-silicone-quick-release

[@happyjason123]

@@JustWatches1 Thank you. You are awesome! Keep up the good work man

[@Arijit22]

How long a battery lasts in these watches ?

[@JustWatches1]

2-3 years I believe

[@yoheff988]

I would rub a little bit of Denco waterproof silicone grease on the gasket before closing the case, they cost around$4 or $5 at Home-depot.

[@JustWatches1]

Yes, this is a great tip, I should have done this!

[@sergensv]

What movement inside?

[@JustWatches1]

It has a Module 5507, +/- 20 seconds a month and ~3 year battery life.

[@AntonReut]

hattori quartz watch movement vx62e

[@MrDanijelho]

I open my citizen ny0040 i as it went seven seconds minus a day then i closed it and i don't care so much for water resistance because i don't dive i just swim and everything is fine

[@JustWatches1]

True, if you don't take your watches into water you don't have to worry as much about getting all the gaskets resealed perfectly. I don't dive or anything either. The most water my watches see is the dishes (and I usually take it off for that too, LOL).

[@malop777]

Excuse me, could you tell me what movement that watch uses?

[@JustWatches1]

Casio Module 5507

[@malop777]

@@JustWatches1 but that movement is? Miyota? Etc?

[@JustWatches1]

As far as I know Casio makes their own movements

[@malop777]

@@JustWatches1 no , it uses miyota movements and some others, thank

[@ragnarone5409]

Thank you for this video.

[@JustWatches1]

You are most welcome, I hope it was helpful :)

[@kindalost1]

תודה

[@vladspb_]

Good job!

[@JustWatches1]

Thank you! :)

[@sergeysedyshev6746]

привет. а на родном языке есть такой же видос?

[@Chi-Sho]

Зав мАч , ёп та ❔❕