Respectfully disagree. You take an OLD 25/35 ah aircraft battery and float it
at 13.4 for a week or so and it will burp acid. New ones will not, old ones
will. Been there, done that.

Your huge batteries may have a better thermal characteristic than these little
loaves of bread, so it may not be a problem for you.

Jim



Ron Rosenfeld
shared these priceless pearls of wisdom:


-
-Living off the grid, and relying on FLA (flooded lead acid) batteries, I
-have had a lot of experience in maintaining them. For the FLA batteries,
-the manufacturers generally publish a recommended "float" voltage. So what
-you need is a voltage limited charger.
-
-For example, for my particular batteries, the recommended float voltage
-(which is what you would use to keep a fully charged battery fully charged)
-would be 2.20-2.23 volts per cell, or 13.2-13.4V for a nominal 12V battery.
-
-A higher voltage would be used for charging (14.2-14.7V in my case).
-
-At 13.2-13.4V, my batteries would not be overcharging, and the electrolyte
-would not be leaking out.

Jim Weir (A&P/IA, CFI, & other good alphabet soup)
VP Eng RST Pres. Cyberchapter EAA Tech. Counselor
http://www.rst-engr.com