Question about B&O BeoPlay A2

Hello all. I have an A2. About a year ago I had problems with my battery. I had it replaced at a B&O shop. Then it worked again for about 4-6 months. Then suddenly it stopped. Then I went to the same store again and the employee said that my A2 was a total loss. Since then, my A2 has just been lying around at home for 3 months. When I had a visit from a friend, she had her A2 with her, I exchanged the batteries and suddenly mine was charging again, although nothing had lit up before when I had plugged in my A2 with its own battery. And a third time I went to the store, he plugs my A2 into the power and it works again. Now I have plugged the A2 in and it has been charging for 4 hours but only shows 60% in the app. Can anyone help me please ? Thanks in advance