Except my sbj-1 lasts for 2 days (if only just[*]) on my normal daily use.
And I've still got the original battery in it!

I purchased the PolarCell battery more than a year past but still have not taken it into use since the original battery works so well!
And it has been my daily driver since day 1, which is what, almost 3,5 years!

[*] OK, granted it is only just 2 days and after that it is something like 15% left in the evening but still fairly impressive IMHO