Electronics > Beginners
My e-cig died.
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Ohgodwhy:
So my e-cig died few days ago. I was curious why. Decided to open it and test the batteries. Everything seemd fine - they are just discharged. I' ve noticed something odd. On one of them the polarity was reversed. I checked it and my digital multimeter showed that the "-" is not a minus. After plugging it to my power supply and charging it for a while it died. Any ideas what happend? I've googled where are those batteries from but I found only chinese sites, so no help. The second one was alright and after a few minutes of charging the voltage increased.


Ps. They are 3,7V 2400mAh batteries.
sstepane:
Hi,

There are two batteries configuration in e-cigs. Parallel and in series, so it could be in series and the resulting voltage will be 7-8 volts for 2 cells or 11-12 for 3.
And, of course, if a battery is charged in reverse polarity - minimum of what would happen - it will die.
Ohgodwhy:
I totally get that. At this point I care more about why there was a different polarity then written on the battery than about it dying. I' ve checked sevral times and It was written in the wrong way - or I thought so (because the battery died).
sstepane:
As far as I know - it could happen - totally discharged battery could change its polarity. But it is more likely it was labeled wrong in the factory. I've repaired some several hundreds of e-cigs, but have never ever seen either reversed polarity or wrongly marked cells.
Ohgodwhy:
Well I don't think there was a human error but you know - I could be wrong :p. If it was labeled wrong in the factory it woulnd't have died. I plugged the second battery the same way and its working. Maybe it really was reversed polarity thanks to descharged battery.
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