A 100# battery is going to take a while to trickle charge.
What is that? 250AH?
Maybe put the 10A to it for several hours,
then back to the trickle charge.
Either way it is going to take a while.
The ones that say 'charged'.
The starting battery, hook up a head light for an hour and see what it says.
The trolling battery, do it for 2 hours.
A bad battery can read 'full' after charging.
It is after some discharge when it shows up as bad.
An excessivly bubbling battery while trickle charging is a bad sign.
All the cells should read close to the same.
The more BBs a tester has the better.
Maybe I'm paranoid about boat batteries.
I get a new starting battery every year,
and test the deep cycles.
And I carry a full 12v 7AH.
At least my 'Coast Guard come help me please radio' will work on any of them.
Here by the Great Lakes people die because of bad batteries.
G-