HPDL watch

After couple of weeks wearing the watch I've noticed that CR2450 doesn't really fit the device - it's nominal voltage (3 V) is really just above a threshold when the watch stops working. I've checked and found out that it turns off when voltage drops below 2,9 V and it's quiet an issue, because CR2450 nominal capacity is calculated from 3,0 V to 2,3 V. Sometimes you can even buy this type of battery from the store when it has less than 3 V left. 

So I decided to change CR2450 to rechargeable LiPO battery with 300 mAh capacity. Besides ability to recharge it, it has a short circuit protection built-in and protection from overdischarging - it cuts output when voltage drops below 3 V. And it works very well! I have short circuited my watch few times accidently when washing my hands or in the rain and protection worked. 

P.S. it feels better for my whrist to wear the watch with a new battery :)

I always wanted to have a watch but couldn't afford it. I used to ask family and friends to buy one as a gift for my b-day or Christmas, but they are pretty supersticious about it (it's said that a given clock shows you the time till your death). I read hack-a-day really often and I've seen some cool projects about making watches (even smart ones!). I've been having pretty cool old-school display HPDL-2416 so I thought that maybe I could build a watch by using it.

And I did. I'm very satisfied with the result. In the beginning I thought it will come quiet ugly and I'll need to make a case for it, but now I like how it looks. And the really cool thing is that I made some swag by myself and I feel proud of it :) .