Thomann Battery 12V 4,5Ah

Since i bought my Fishman something was wrong the internal original battery.So,i left my amp to a music shop in Milan,they fixed it but after a while same problem occurred again.I was fed up. I even thought about selling the amp.
Then I asked Thomann if Fismann didn't have an original battery for this model.They offered me this one. This time I didn't take it to the service or any master.
I learned how to open the amplifier and change the battery from the videos and user manual.Frankly, I was afraid of doing something wrong, but I changed the battery within 45 minutes without any problems.
and meanwhile I saw that the battery that was installed before was not of the same quality and voltage.A more mediocre quality no name product and a weaker battery was installed.Anyway, I am very pleased with this new product. The amplifier works without any problems.Vielen Dank Thomann!