Maintaining batteries is a necessary but unpleasant task. If neglected and ignored you will pay the price by shortened battery life and corrosion in the battery compartment.
Here is a link to an article that describes a product that many have found to be beneficial to their conscientious battery maintenance. It is quite lengthy but easy and understandable reading. The product source is noted near the end.
I am sure that some in POG are already using this:http://www.ibiblio.org/pub/academic/.../11/11pg37.txt
Now stop that gas at it's source and no it doesn't work on biogas!
JIM