been using east penn for 6-7 years now no issues just top up in spring and go, they are traded under the name of power surge, die hard, carquest batteries are east penn as well put my trolling motor to two days of hard use before a charge just make sure you get the true deep cycle and not the dual purpose.
walmart and costco batteries do seem to do a decent job as well from everyone i know that uses them.
peterborough battery is a great place to deal with if your in that area