I have a 2010 MacBook Pro with 256GB SSD and 8GB RAM.
However, it lags horribly when it's down to 0% - even when connected to the power source. Also, it takes over half an hour to get to 1% - then, it starts charging at an adequate speed.
Additionally, it won't get to the 1% at all when it's on. It has to be sleeping or off.
It's been doing this even before it became obsolete (in June 2017).
Why is my MacBook doing this? How can I fix that?