by Burgerman » 27 Nov 2021, 19:26
It will gradually deteriorate, due to incomplete charging at too low voltage. Maybe 200 cycles instead of 450.
An AGM needs 14.4V minimum. Preferably 14.6V. And it needs to stay at that voltage for 8 to 10 hours in cyclic use.
A gel charger if its any good, will be 14.1V max. And will charge at this voltage for 12 hours approx.