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I tried to go higher on mine as well. The challenge was I luckily measured the old battery as well as the battery bay to refit a new one. It's pretty specific for the OEM size battery.
I had to get a battery recently and just by asking the Autozone guy for the lightest weight battery that would meet the specs for my car. He was going to sell me a 40lbs battery, but he found a 33lbs one that works.
I have used the Interstate replacement battery before and it worked ok. Got one from Wal-Mart last time and it is working fine so far...better specs, readily available and a lot less expensive. Unfortunately batteries no longer carry the long warranties they used to at one time.