If you check under site issues you will find the forum rules. I suspect it is this one:
- Advertising or Spamming
Electro Tech does not allow spamming in any forum, if we find spam it will be removed and a warning or ban will be issued on your account. We also do not allow any form of advertising (or deliberate types of promotion to benefit a third party site) unless it is in the "Buy, Sell and Trade" forum and prior arrangements have been made. Please also note that while we do publish all links to external sites without using "nofollow" tags, this is considered to be a privilege to members and not a right, in severe violations or abuse, this privilege maybe revoked.
So on to your question. Do you really need a circuit to turn it off? Won't the charger do that?