The installation was easy. The accompanying description with respect to the handling of the two enclosed tools quite concise and also difficult to see.
The first full charge then took me about 4 hours, because I thought there was something wrong with the battery. But all fears towards making the replacement battery excellent job. Meanwhile, I can listen to music almost 15 hours straight! That's more than the original battery ever there was - I'm thrilled!
As I have informed me in advance how the installation works, I can cope with the scarce instructions very well.