capacity of guest chargepro battery charger

[mgraham]

I bought a guest charge pro 30 amp battery charger a few years ago, two outputs, one 10amp, one 20 amp. I just upgraded my batteries to two agms, but stopped at 100 amp (group 27) because the guest material had a note in it that the max was 100 amp for charging, 200 amp for maintenance. I called the guest tech line, but they didn't want to commit. Does anyone know how sensitive these chargers are, and whether I blow the charger if if add a second 100 amp battery (hooked parallel) on one of the banks. I just don't know if these are real limitations, or whether they are the equivalent of a 55 mph speed limit sign on the interstate.

thanks, Mike Graham, Pearson 10M, 1974 A-4.