Does your charge have provision for a temperature sensor on the battery?
If not then the higher temp of the batteries will result in overcharging.
Overcharging a wet battery just leads to water loss (unless it is extreme).
Overcharging an AGM will quickly destry it.

Doug
s/v Callista

"TORMAC53" wrote in message
...
I have two AGM batteries in wooden boxes. They are right next to the
exhaust of
a 85 hp perkins. This is the second set to "die" an early death. How
sensitive
to heat are these. If in a well vented box of 3/4 marine ply that is
sealed
with epoxy and painted, with a lid. How hot could the exhaust get the bat.
Real distance from the bat is 1" inside, then the 3/4"ply, then 4 to 5 "
to the
mainiflold.
I want to stay with the AGM but never had this problem with the wet batts.
I
will add heat and sound sheilds into the area if I have to but it is
crowded
there already.
Thanks
Bob