I don't even want to add up the money
I've wasted on cheap
batteries, its without fail been my experience that you do in fact get what you pay for when it comes to deep cycle batteries.
I'm not even impressed with the automotive batteries walmart sells, the factory battery in my truck was 7 years old when it went bad, I replaced with a walmart battery and it had to be replaced once again within a year ( I sold the truck with the replacement battery in it). I used one of their AGM
batteries in the dinghy
for the bilge pump
, charged 4 times and it wouldn't take a charge after that.
They'll take them back no problem, but it becomes a pain in the butt to return them every 6 months, not worth IMHO.