Just as an aside.
The link that Woof has above this post is about the best (IMHOP), FAQ one could ever want for information on batteries: Deep cycle and SLI types. I have DL'd and printed it (about 147 pages for what I needed), and yea it has been of enourmous value in saving my 2 - 2yr old trojans (t105's).
thanx woof.!
They were sulphated a bit. (80% capacity). I am now in the process of trying out a water based retail product called Battery Equaliser. (cheaper than buying a pulse charger), The manufacturer professes that it will desulphate a battery to some extent. We shall see how that works.
www.batteryequaliser.com (no I am not an agent for them by any stretch...but some interesting testimonials on this stuff.) any comments on this stuff from previous experimentors would be welcome BTW..??
Bottom line is that all batteries need to be kept charged and not with a trickle but rather a float charge. As noted a trickle charge will in fact overcharge batteries and likely destroy them.
for what it's worth.
stk