Gold Shine batteries very disappointing

I recently bought battery bank from Solar Links Energy consisting of 4x 100ah batteries for my solar inverter. Mid load shedding, they were only supplier with stock, also at a reasonable price. The delivery went well. The Gold Shine batteries look 100ah but slightly lighter in weight than my existing 100ah batteries. Very disappointingly they could only run my inverter for 30 minutes compared to old batteries running 3 times as long at same load. I reviewed the product on their website which they still have not published. Can see why there are no reviews. They are *******. Rather spend more money and get proper batteries.