First of all, I love this video on how to make your own iontophoresis machine. I makes the whole process seem incredibly easy, to the point where I was left wondering why don't more people opt for homemade devices… (But yes, I know, portability is a big issue with homemade iontophoresis.)
I would like to know how long the battery life is in homemade iontophoresis. And even more importantly, how do you know when is the time to replace the battery? Is it when iontophoresis becomes less effective or weaker (in other words, when you start sweating more)?
Thanks in advance!