looking for some battery info

[Siochanai]

I am looking to figure out more about the batteries I am running for saftey purposes as well as to get the most longevity out of them. I am a micro electronics nut but only know basics about batteries. I knowbthe dangers of over exersion on batteries so I am looking to the more knowlegeble battery nuts to help me out a bit.

I have 2 different batteries for different mods. Both sets are purple efest as these were what my local vape shop recommended but I am not very sure if the recommendation is a good one.

First is a 26650 3500 mAh 32 A/64 A battery. This is not really the one I worry about because all info i find states it has a 32A constant current draw.

The second is a 18650 2500 mAh 35 A battery. This one I am not sure about. 35A seems high for the constant draw on one of these.

Neither battery lists the C rating so I can't really crunch numbers.

Any help would be much appreciated. As of right now I am running 0.8 ohms on the 18650 which should be safe but still looking for some advice and info.

 

[anumber1]

If the 2500mAh "35a" 18650 is a purple efest, It is a rewrapped LG with a 20a max constant discharge.

 

[Siochanai]

Ok cool that is a breath of fresh air that gives some leeway in atomizer+coil resistance as long as the current output does not drop too fast.

Edit: I have also seen numerous values on lowest discharge levels. What is a good safe number. I have read everything from 3.6V to 2.5V?

 

[Baditude]

IMR batteries are safe down to 3.2 volts.

IMR/hybrid batteries safe down to 2.5 volts, but don't make a habit of it.

Battery Basics for Mods

Deeper Understanding of Mod Batteries

 

[Siochanai]

Ok cool I have been charging at about 3.6 as I find i get the best vape from 4.0 - 3.7 volts. At 3.6 it seems to start losing that nice flavor, warmth, and cloud I like. Thanks for the info.

 

[DaveP]

Longer life comes from lower discharge. That's a result of less stress from charging and discharging. Internal resistance rises over time with the heat of high discharge rates and high charge rates. The easier we are on batteries, the longer they last.

I sometimes let my 18650's go to the Provari 3.2v cutoff point where the LED flashes. When I'm checking the voltage periodically while vaping I rotate them into the charger at 3.5v. Heat is the enemy of both Li-ion/ICR and lMR batteries. Discharging and charging produces that heat. The longer they have to charge, especially at high charge rates, the shorter the useful life.

You can extend the life by charging at .5A, but that takes twice as long as charging at 1.0A. 26650s are said to take 2A charging without high stress due to the greater mass of their electrolyte volume, but even with those a 1A charge will lengthen their useful life.