Deprix is just an online retailer selling a rebranded (Interstate/Cycletron) which you do not want. I made the mistake of trying to save some scratch by buying the Interstate which failed after two months. Then went through the headache of trying to get my money back instead of one year exchange. I was successful and then went to the stealer to get OEM. Living and learning the hard way.
Unless something has changed drastically in the past years I'd have to say you are the exception to the rule for Interstate batteries.
I know a fair bit about lead acid batteries (was in charge of the one on my submarine for 3 1/2 years, went to school, QA, etc) and I've never had issues with them or heard of people having bad luck with 'em since I started workin in a garage in 1984. I used nothing but Interstate in anything I've owned that needs a battery.
You have not said your bike is starting harder.
Could it be the charger?
Just a thought.
I just had a Battery Tender Jr do the same thing, it just stays red and never goes green. It cooked the battery in my ATV, so I bought an Interstate for it. Check the Battery tender first.