Has anyone found where to buy 2.5 Volt battery's in either in ICR123A, or, TR15270 (CR2) ? If so PLEASE post the site here>
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I don't think there's a 2.5v battery out there, unless it's maybe in some sort of pack. If so, it's probably going to be rare and expensive.
What are you trying to do, if I may ask? Maybe there's an easier workaround.
What are you trying to do, if I may ask? Maybe there's an easier workaround.
Yeah, I'm no expert, but I didn't think the internal chemistry of a li-ion battery allowed for anything other than a very few limited voltages (3.0v, 3.2v, 3.6v, and 3.7v, if I remember correctly).
Awhile back I also was looking for 5V batteries or 2.5V seems there not made yet ... if you happen to find some please let me know 
Ok - you can use a small resistor or a voltage regulator to pull the voltage down to 5v.
I know, but I just want 2.5 battery's, is that such a hard request, you, and most of us vapers would buy them, so let's shout out loud, maybe they will HEAR US.
Again, not an expert, so I'm willing to accept an alternate explanation from someone more knowledgeable, but I don't believe it's an issue of consumer demand, just a limitation of the technology. Battery voltage is a function of the materials used, which is why alkalines are 1.5v, and nimh are 1.2v. Supercapacitors can hit 2.3v, but I have no idea how to go about using them in a mod. Actually....hmm....research time!
You could run 2 2.5v Supercapacitors in series for 5v or just use one of these 5v Ultracapacitors..
Digi-Key - 589-1007-ND (Manufacturer - EMHSR-0001C5-005R0)
Still trying to wrap my brain around the numbers but it might be possible.
If you thought shorting out a lithium ion battery was bad, try it with a supercap. I've seen screwdriver tips (the tool, not the pv) blown completely off shorting a capacitor.
As stated above, the battery chemistry doesn't support it. So, the choice is up to you; CR123 lithiums with a resistor/regulator, or *FOUR* AA/AAA 1.2v lithiums - both get you right at 5v.
Its not a supplier thing, its a battery thing.
By nature, the output voltage is around 3.0v at a minimum, and 4.2V at peak (closer min/max per battery, thats an overall range). At 2.5V, most li-ion batteries will no longer charge, it will have dropped below the threshold; this is why most protection circuits kick in at 2.7-2.9V.
Now, rather than call it 2.5V, what you want is 5V. So, you can't buy a single li-ion battery like this, but you can buy a li-ion battery pack at 5V. These have the regulators built in, think of laptop batteries - more than one actual cell inside, but joined for a specific voltage, amperage, and higher amp/hour rating.
The downside?
Generally these are fairly expensive batteries, due to the electronics required to make it 5V:
BatterySpace.com/AA Portable Power Corp. Tel: 510-525-2328 - 5V & 6V Regulated Li-Ion Pack Modules
Since work has to be put in to make that specific voltage, regulate it, etc, generally these are larger packs of batteries - several 18650's, for example.
Now, it may be a better idea to look for a buck voltage regulator with a setting for undervoltage lockout. But, no matter how you look at it....
6V or 5V using a resistor is the best bet. The batteries inside even battery packs will be 3-3.7V anyway.
I have seen 5 Volt battery's, they are used for medical devices, and are very expensive.
I'd bet dollars to donuts that you haven't seen 5v lithium-ion batteries in a size that would be practical for modding. You can get a 5v battery pack, but they're going to be too big, and will be made up of multiple 3.7v cells regulated down to 5v, anyway. You may be able to get 5v cells with other battery technologies than li-ion, but they have their own problems (size, weight, poisonous gasses, etc.).
Can you give me a link to one of these 5v batteries?
I did not save it, it was on a web search, just put in 5 Volt battery
You may be able to find a cell phone battery that outputs right at 5 volts. Just keep in mind you would only be able to use it on a "box mod", but it would work.
Even if you find a 5v battery pack, there's still going to be a regulator of some sort. Why get a battery pack with a regulator instead of just using your own regulator?
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