Evercool question

[ericdjobs]

I have a question regarding a mod using the evercool switching regulator (ptr08100w).

The specs say the dropout voltage is 4.5v, so using batteries in a series this is way below the 'safe' area.

My question is to anyone using an evercool mod, how do you tell when your batteries are getting low? I know the protection circuits would trip but I'll more than likely be using AW IMRs (because it's a 2x14500 powered mod, and normal 14500s just don't pack the kick) so I won't have protection circuits.

Let's say you're sitting at 7.2v for 2x batts in a series, will the switching regulator actually give a noticeable drop in performance compared to 8v.. with both outputting let's say 4.2v?

Should I carry my multimeter with me? lol

 

[WillyB]

say the dropout voltage is 4.5v

That's not really the 'drop out voltage' per se.

using AW IMRs (because it's a 2x14500 powered mod, and normal 14500s just don't pack the kick)

It's the regulator that will be controlling the kick, a pair of protected Li-Ions work well with regulators.

will the switching regulator actually give a noticeable drop in performance compared to 8v.. with both outputting let's say 4.2v?

Nope, pretty much 4.2V till the batteries quit. And at that low output voltage the 'quit' will be a tripping of the protection circuit. The IMRs will give you longer vapes mostly because you can drain them past their 'safe' limit.

You could switch over to the Murata switching regulators and follow some of CapeCad's work on voltage limiting.

 

[bstedh]

I have a question regarding a mod using the evercool switching regulator (ptr08100w).

The specs say the dropout voltage is 4.5v, so using batteries in a series this is way below the 'safe' area.

My question is to anyone using an evercool mod, how do you tell when your batteries are getting low? I know the protection circuits would trip but I'll more than likely be using AW IMRs (because it's a 2x14500 powered mod, and normal 14500s just don't pack the kick) so I won't have protection circuits.

Let's say you're sitting at 7.2v for 2x batts in a series, will the switching regulator actually give a noticeable drop in performance compared to 8v.. with both outputting let's say 4.2v?

Should I carry my multimeter with me? lol

I would recommend adding a zener diode and led to monitor the battery voltage. There are details to this in the Low voltage drop out thread. I don't have a link right now but you can look at my started threads and read that one and the OKR-T thread for ideas.

Edit: Yea WillyB CapeCad was the one that helped me out...

 

[ericdjobs]

Ah alright, thanks for the quick replies guys.

I'm not the one building it, actually purchased it. Was just curious if I could rely on the regulator to cut off at a safe limit, which seems to be a resounding NO haha... I read some of that other thread and i have a much better understanding on when the regulator cuts off now.

I guess I'll be checking batteries very often, even more so when using my IMRs (I only have 1 set of protected 14500s.. my other set are AW IMRs.. ordering some more protected ones as we speak.)

 

[bstedh]

You can get protection boards for your future batteries. You just have to be carefull that when you wrap them you don't make them to big to fit in your mod...

 

[sierra22]

It also depends on your voltage that you are vaping at how far it will drain the batteries down.....when your batteries can't supply the regulator with the power it needs, it will just stop working, literally, one puff there, next puff none.

 

[crk0756]

So far, mine has been flashing the led when the batts are low, I also check them with a voltmeter every once in a while.... I am using protected 18650's....