How long to charge? (Venice hybrid tech grid charger)

I’ve had this old grid charger for years (as you can probably tell by how dirty it is!) And want to use it again.

The guy that build them and sells them says to charge for only 5 or 6 hours, drive it around and do it again for 3 days in a row. we I can’t remember this changers output, but it’s very low, and from my experience in 5 or 6 hours it does do much at all, barely raising the SOC. I remember one time I did 12 hours and it still didn’t seem to do much. I emailed him and told him how long I changed it for and he basically scolded me for charging it that long.

This is a 2008 Prius with over 200k. The battery still seems to have very good capacity, staying at 6 bars SOC almost all the time, even up long inclines.


Dr Prius says there is a 0.12 voltage difference.
No hybrid battery codes.

 

yeah his website is pretty bad. But the fact is, I have it now, maybe it was a mistake when I bought it 5 years ago. Should I not use it at all?

 

Well when I follow his instructions it doesn’t seem to be long enough to do a top end balance. 5-6 hours barely seems enough to fill the pack.

So basically I’ve lost faith in the old product because his instructions don’t seem accurate, but I also don’t want to damage my battery.