How Many Charges?
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One thing nice about being a tootle puffer. No worries on batteries exploding in my face or anything. My batteries all have over current protection, low voltage protection and overcharge protection built in.
Batteries will be one of the cheaper aspects of your vaping. Unless maybe built in ones in regulated mods... Of course something else about the mod usually fails before the battery wears out 
Exactly.
That is why it is a Tough Question to Answer when someone asks how long will a Battery Last.
On a mech mod with a crazy sub-ohm build they last around 200 charges (always at their peak discharge rate). But with a regulated mod running at 50w, they last for like a year. But most reputable batts are guaranteed to last for about 500 charges when used with their normal discharge rate.
A factory coil or one you rewick? I have t3 coils I have been using for months, just rewicking them.
some of those are the original coils I just pulled out the silica rinsed and put in cotton. The rest were 1.8 and I recoiled to 2.0 with 32 ga Kanthal.
Same with my Evod coils. About 50/50 right now on the coils. I have not had any actual coils go bad. I have messed up a couple while rewicking and recoiled them.
With tootle puffing the actual coil almost never goes bad.
Certainly...
Dropbox - thermal runaway caused fire and explosion of lithium ion battery.pdf
Dropbox - li hazard assessment.pdf
Dropbox - sandia thermal abuse report.pdf
Dropbox - general li safety.pdf
https://www2.unece.org/wiki/download/attachments/8126481/EVE-06-05e.pdf?api=v2
http://www.datamax-oneil.com/do/de/en-us/home/printers-software/stationary-printers/desktop-printers/file.cfm/Lithium Ion Batteries.pdf?contentID=4749
https://etd.ohiolink.edu/!etd.send_file?accession=osu1306937891&disposition=inline
Lithium Ion Battery Aging Factors - Knowledge Base - Knowledge - IngenuityWorking
Lithium Battery Failures
[edit] the research papers can be slow reading but there are some great nuggets of info regarding internal resistance rise and capacity loss due to aging. Battery University may have some stuff on this but I gaven't checked.
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IKR? I just ordered 4 more VTC4s after our discussion of allowing them to rest after discharge before charging. Batteries I got, lol.I take reasonable care but with 25R's being $5 each, this average vaper just buys new batteries.
yes in an older battery resistance rises and if you keep trying to draw 20 amps when it can no longer supply it bad things will happen.
you should notice decreased time between charges long before then, but if like me you only draw a few amps it is not a problem.
I am sorry, I asked about "dangers" of aging battery. Not about all dangers of li-ion battery.
And the best way to keep batteries that you are not using is at about 1/2 to 2/3 charge. Keeping them fully charged is hard on them.
Because the battery requires time to cool to ambient and to re-order it's internal electrical charge state after use and after charging. Similarly, they should not be taken directly off the charger and put in the mod.
Because they get tired? Well in a way. I think it is to let the chemical processes stabilize.
Again not a real issue in lower drain applications.
You know, I tried to find an answer to my question, and the only reference I've got was related to testing a battery, so they like to rest a battery to have a more repeatable results. And nothing about degradation of a battery due to use immediate after charging. But I may miss something, who knows...
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