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Sorry you didn't get a response - how did you try and contact us?
I did send a Email to contact@espruino.com since that was the support email adress i found over google.
However if you're talking about the LR2032 type batteries, these are marked as 3.6v but since they're LiPo when they come off the charger they can be near 4.2v, which is way too high.
I was looking on Amazon for rechargable CR2032 alternatives, and found as an example the LIR2032 (the package says they are 3.7v). I have also found others who say they are 3.6v from random companys, but i was unsure if they are really 3.6v & if my Puck.js would break from those since it usually only has to deal with 3v from normal CR2032's.
However it looks like Maxwell do the ML2032 which uses a different chemistry and has a voltage that's well within range
That's nice to hear! The ML2032 was one of the types i was looking at and wondered if it would work.
My Main Application for my Puck.js uses daily around 30-60 Minutes of running code which is requesting Accelerometer Data once a second. This results in one battery only lasting around a month, and i wanted to prevent having to buy always new batterys all the time. So i thought getting rechargeable alternatives for the CR2032 would be smarter since it is easier to just recharge than buying new ones all the time. That's mainly why i wanted to know this.
So thanks for the quick response & for helping me :)!
Hearing that the ML2032 should work is good, because i was really worried i destroy my puck.js by accident if i just test it out myself.I wish you a nice day,
Cyyy
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Cyyyy
@Gordon
Hi,
Sorry you didn't get a response - how did you try and contact us?
The Puck has a voltage range of up to 3.6v - although the absolute maximum is a little higher, so going 0.1v or so above that isn't a big deal.
However if you're talking about the LR2032 type batteries, these are marked as 3.6v but since they're LiPo when they come off the charger they can be near 4.2v, which is way too high.
Potentially you could use those if you ensured they were run down a bit so the voltage was lower, but it's a big risk.
However it looks like Maxwell do the ML2032 which uses a different chemistry and has a voltage that's well within range, so you can use that: https://www.maxell.com.tw/images/uploads/2015/05/ML2032_DataSheet_table.pdf
Also I'm not even sure if they exist, but if you could get a LiFePO4 based CR2032 cell, that would have a voltage that'd work great as well.
Earlier Puck.js versions did actually have a PCB trace you could cut and the ability to add an SMD diode to drop the voltage for LR2032, but there was so little interest it got removed for all the most recent ones