[911pcars]

I think you'll get more anecdotal than objective opinions, especially on a short thread, thus far.

Try this list to whittle down the top 5 candidates based on your personal "best" criteria:
https://www.google.com/search?q=recommended+battery+trickle+charger&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-USfficial&client=firefox-a&channel=sb#channel=sb&q=review+recommended+battery+trickle+charger&rls=org.mozilla:en-USfficial

Sherwood