Hello everyone Steve from Ontario Canada. I just picked up a 500w Gio PB710 Ebike. I want to swap out the SLA batteries for a LIFEP04 Lithium iron phosphate battery bank. The question I have is my controller is 48v 17ah 60a and the SLA batteries are 4 @ 12v x14ah my new battery is 51.2v 19ah 60a would my controller be ok or do I have to swap that out too? I know that I will have to get a new charger to charge the ne battery.. Thanks in advance Steve