the trickle charger would be perfect. i use one just like that for all the sla's i own. and as far as powering those amps, this would be good for about two to three hours of low to mid volume, but i would suggest you just go for the 5 or even 7 Ah battery. they are not to much bigger and will pack a lot more time into a single charge. i have two 7.2 Ah sla's and a 17Ah sla and they all work great, though i use the big one for whole days at the beach. i hope this helped you!