Legit batteries for Nokia E6? (BP-4L)

Basically I found an old Nokia E6 in my room, it used to be my mom's but she hasn't used it in like 10 years so it just sits in the house. I managed to power it on after a long while of charging, but the power dies within a very short period of time. It still has the original battery and is mostly in excellent condition, the original battery hasn't even swollen up yet. But I need a reliable alternative, found a few cheap ones on amazon but not sure how reliable they'll be. Any advice? I wanna use the E6 for my basic mp3 player needs so I can reduce my screentime on my main phone :/