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Seiko S771 EPD E-Ink Watch - batteries

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Plato

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Seiko S771 EPD E-Ink Watch - batteries

Post26 Jan 2018, 14:55

Good day to all of you
I have had this watch for several years now.. bought it from a member on here. It is a lovely watch as a daily beater but the charge has gone completely for some time now and no amount of sunlight will revive it.

I took off the back and it has a CR1616f cell. As the watch recharges I assume this is a rechargeable cell.

I have a spare CR1616 in my battery box and that has gone into the watch without a fuss, and it works. However, is it the correct cell? It doesn't have the f suffix and I don't know if it will recharge. If its a non-rechargeable cell, will the attempts of the watch to recharge it cause a problem (i imagine the cell exploding on my wrist...).

Any advice welcome.
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Kasper

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Re: Seiko S771 EPD E-Ink Watch - batteries

Post28 Jan 2018, 16:32

have the same issue..i'm always at home in my shop, so it cannot take enough juice during the day and slowly dies. Just buy a new rechargeable cell and you are good to go. If i put the watch near the window all day..it's just enough to stay awake :-D
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Plato

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Re: Seiko S771 EPD E-Ink Watch - batteries

Post28 Jan 2018, 17:20

Indeed my friend... I am wondering whether to just replace the cheap cell as each runs out. Ill see how long this one lasts.
They only cost a few euros maximum. So then the cost will be negligible.. As long as the cell doesn't have any bad effects on the watch.. it isnt a rechargeable at that price and the seiko website states that they use special batteries which I can't seem to find.

I'm let your know how the experiment goes!
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767Geoff

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Re: Seiko S771 EPD E-Ink Watch - batteries

Post28 Jan 2018, 20:59

If the recharge system functions then yes, the cell can react badly. Most likely by swelling and leaking. There is an argument that a very slow trickle charge to an alkaline will result in recharging of the cell but the physical structure and internal chemical make up were not designed for recharging. Lithium non-rechargeable batteries do not like recharging and can result in a runway chemical reaction destroying the Battery and probably the watch module. Lithium batteries HATE two things:

1). HEAT. (So charging a non rechargeable lithium is lethal to the Battery.

2) deep drain with no recharge (I.e. use until dead then recharge attempt)

My Star Wars EPD recharge circuit failed at the 3 year mark. The watch went to Seiko japan who replaced the charging circuit with a newer mark ‘2’ version 3 years ago and to my surprise, for free, except shipping. Holds a perfect full charge always now. Of course I leave it near the window when not in use, not at the window and never let it cycle to dead.

I would hold off, find a rechargeable 1616 lithium battery OR cut the recharge circuit wire for a permanent solution and only buy non rechargeable batteries. Careful as the recharge circuit may be involved with current transfer to the watch.

Amazon Canada (assume USA also) https://www.amazon.ca/Casio-CTL1616-Genuine-Rechargeable-Battery/dp/B0080GQBTU

Geoff

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