thanks for the tip!
sorry, i was wrong. battery voltage is 3.7V and still firing ok.
i think that the main problem is its 2.5A (or even lower) cutoff (instead of nominal maximum current of 3.0-3.5A). this limits the combinations of resistance and power/voltage very much. you could only reach near 15W with a 2.4ohm coil, according to Wattage = Current x Current x Resistance; 10W with 1.6ohms, 7.5W with 1.2ohms...
together with another kind of cutoff that i'm not able to locate. it fires for a second, and then stops firing. maybe there is another glitch in my chip, dunno.
i think that the vamo 5 i had, was able to deliver higher current than that, although it was delivering a PWM signal (semovar delivers flat signal).
the result is that i'm not able to vape at higher than 7W aprox

will use it for some atty rebuilds, dry cleaning.. or as a paperweight, lol.
or i might try to find another kind of suitable chip to replace the existent one.. or might convert it into a mech, by using stingray tubes and cap, and a origin switch (if manage to find one..), for example..
if i'm not wrong again, of course..
bah, never mind, because... the sxmini is here! yiihiiiiiiiiii

absolute flexibility. more than enough power for me, it does whatever you need it does. with pretty accuracy and effectiveness (at flying first sight). 5 memory settings. plenty of info (but i miss the current). it gives you easiness and confidence. playing with my lowest resistance setups (drippers, trying my new magma now).
small, sexy, light but sturdy. well thought, you can set the 510 pin and battery rattle by adjusting the 510 pin plus screwing the bottom door more or less. simple and effective.
i have a crush on this lovely thingy. best christmas gift (buy) in many years. it's worth it, no doubt, the only regulated mod i wanted =)))
thank you very much, Nicole <3