few questions about regulated devices.

[Muskulls]

Ok so I just purchased the hexohm v2 and I am confused about a couple of things. The chips amp limit is 20a but all batteries that are 20a have a "pulse" or "max" discharge of something higher than 20a, regardless of the continuous discharge being 20a. I've read through some threads and people say to ignore the pulse rating cause if you're building to that rating you're being extremely careless and unsafe. I'm confused cause as vapers don't we technically use the batteries in a "pulse" fashion. Also the max voltage of the hexohm is 6v but with two fully charged batteries in a series build box mod, they will be pushing 8.4 volts, correct me if I'm wrong. So why is it that the batteries technically are pushing 8.2v but the device says it only goes to 6v?

 

[K_Tech]

1. Yes, we technically use the batteries in "pulse" fashion, but there isn't a solid industry standard for what a "pulse" really is, how many pulses you can do within a certain time frame, and what temperatures you can safely achieve (in the battery) by pulsing. CDR (Continuous discharge rating) takes the battery to that current limit until it's discharged.

Think of it as a red line on an engine. Most engines can be taken (somewhat) safely above red line. How hard and how often is the unknown quantity.

2. The voltage output of the chip sets the voltage limit, simply put. The OKL2-T/20-W12 chip takes a relatively wide range of input voltage (4 to 15 volts IIRC) and provides a stable, regulated output voltage.

 

[Thrasher]

The maximums of the chip arent what its asking of the battery im many cases to get to that 20amp limit it will have to pull more then that from the battery for conversion.

There is also age and degradation of the battery over time, while a new cell may very easily handel its max pulse current today. That may not be the case in 6 month's.

Also if you build to the batteries maximum limit what happens when you encounter a short? There is no buffer anymore as the cell is already taxed under maximum load.

As for the 8v 6v thing, again there is a loss to conversions. And batteries do not stay at maximum charge the whole cycle. And as the battery charge drops the mod will make up for it by pulling more and more amperage from the battery and converting it to voltage.


Say the mod uses the maximum amperage the battery can push on full charge. Over time the battery drains and now the mod needs an additional 7 amps to keep giving you 6 volts at 40 watts. Suddenly we would have a very stressed battery on its way to eventual failure.


Running a battery to its pulse rating is not a problem but as vapers we pulse every few minutes, the battery pulse rating isnt designed to constantly be driven to its limit all day it is there for sudden spikes only, it's intention is more for something like a motor that needs a boost starting a few times a day. Not driven to full capacity 500 times in 24 hours.

 

[Wolfenstark]

Pulse is around one second.
I find most the time when vaping I need to fire the device for longer than one second.